Our Top Choices:
Best Quiet Filter for 20 Gallon Tank: Tetra Whisper IQ 20
Enjoy peace and tranquility without sacrificing performance. The Tetra Whisper IQ 20 operates at less than 40 dB while offering a robust 130 GPH flow rate. It’s the silent guardian your 20-gallon tank deserves.
Best Adjustable Filter for 20 Gallon Tank: AquaClear 50 Power Filter
Customize your filtration like never before. The AquaClear 50 offers patented flow control and a high 200 GPH flow rate, making it the ultimate adjustable filter for your 20-gallon tank.
Best Budget Filter for 20 Gallon Tank: Aqueon QuietFlow 10 LED PRO
Get top-notch filtration without breaking the bank. The Aqueon QuietFlow 10 LED PRO offers a four-stage filtration system and a smart LED cartridge indicator, all at a wallet-friendly price.
The filter is the unsung hero of any aquarium setup. It’s like the kidneys of your tank, tirelessly working to remove waste, excess food, and harmful chemicals, ensuring your finned friends have a clean and healthy environment to swim in. But not all filters are created equal, and choosing the wrong one can turn your aquatic paradise into a murky mess.
So, you’re in the right place whether you’re a seasoned aquarist or just getting your feet wet (pun intended!). I’ve spent countless hours researching, testing, and talking to experts to compile a comprehensive round-up of the best filters for 20-gallon tanks.
The 7 Best Filters for 20 gallon fish tanks
Tetra Whisper IQ 20 Power Filter 130 GPH
- QUIET AQUARIUM FILTER: The Tetra Whisper IQ Power Filter with Stay Clean technology contains a sound shield for quiet filtration less than 40 dB.
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
Looking for a filter that combines high performance with whisper-quiet operation? Look no further than the Tetra Whisper IQ 20 Power Filter. With a robust flow rate of 130 GPH, this filter is perfectly suited for up to 20 gallons of aquariums. But what truly sets it apart is its Stay Clean technology, which maintains healthy pH levels and makes maintenance a breeze.
The filter features a self-priming, submerged motor, eliminating the need for manual priming. It’s like a plug-and-play device for your aquarium! The bio-scrubber cultivates beneficial aerobic bacteria, effectively removing toxic ammonia and nitrite from your tank. Plus, the smart path spillway adds much-needed oxygen to the water, enhancing the overall health of your aquatic environment.
And let’s talk about noise—or rather, the lack of it. Thanks to its innovative sound shield, this filter operates at less than 40 dB, making it one of the quietest options on the market. It’s the peace and tranquility you’ve always wanted for your aquarium, without compromising on performance.
Pros:
- High flow rate of 130 GPH suitable for 20-gallon tanks
- Stay Clean technology for easier maintenance and healthier fish
- Self-priming motor for hassle-free startup
- Exceptionally quiet operation at less than 40 dB
Cons:
- Cartridge refills are not included and must be purchased separately
- May be overkill for tanks with fish that prefer gentler currents
Marineland Penguin Bio-Wheel Power Filter 150 GPH
- WITH ROTATING BIO-WHEEL: Patented Bio-Wheel technology provides excellent wet/dry biological filtration.
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
When it comes to multi-stage filtration, the Marineland Penguin Bio-Wheel Power Filter is a standout choice. With a powerful flow rate of 150 GPH, this filter can handle your 20-gallon tank, ensuring a clean and healthy aquatic environment. But what sets this filter apart is its patented Bio-Wheel technology, offering superior wet/dry biological filtration that keeps your water chemistry stable.
The Marineland Penguin doesn’t just stop at biological filtration; it also excels in mechanical and chemical filtration. This multi-stage approach ensures that your tank stays clear of both visible debris and invisible toxins. It’s like having a three-in-one cleaning crew for your aquarium!
Marineland is a brand you can trust, with a long history of providing reliable and technically advanced aquarium products. The filter is compatible with Marineland’s Rite-Size Filter Cartridges, making it easy to find the right replacement when needed.
Pros:
- High flow rate of 150 GPH, ideal for 20-gallon tanks
- Patented Bio-Wheel technology for superior biological filtration
- Multi-stage filtration for comprehensive cleaning
- Reliable and trusted brand in aquarium products
Cons:
- Cartridge replacements are specific to Marineland, limiting third-party options
- Higher flow rate may not be suitable for fish that prefer calmer waters
Aqueon QuietFlow 20 LED PRO 125 GPH
- Dense floss removes particles and debris
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
If you’re in the market for a filter that goes above and beyond, the Aqueon QuietFlow 20 LED PRO is a top contender. With a robust flow rate of 125 GPH, this filter is designed for optimum performance in 20-gallon tanks. But where it truly shines is its four-stage advanced filtration system, ensuring that your aquatic environment is as clean and healthy as it can be.
The Aqueon QuietFlow offers dense floss for particle removal, activated carbon for toxin elimination, a patented bio-holster for ammonia and nitrite reduction, and a diffuser grid that adds oxygen while further purifying the water. It’s like a full-service spa for your fish!
One of the standout features is the LED filter cartridge change indicator. No more guesswork; the light will flash when it’s time for a cartridge change. Plus, the internal pump design dampens noise for quiet operation and eliminates leaks and self-primes, making it incredibly user-friendly.
Pros:
- Four-stage advanced filtration for comprehensive water purification
- LED cartridge change indicator for timely maintenance
- Internal pump design for quiet operation and self-priming
- Higher flow rates for better oxygenation and more active fish
Cons:
- The complexity of the four-stage system may require more frequent maintenance
AquaClear 50 Power Filter 200 GPH
- Aquarium filtration system that offers superior contact time with filter media and energy efficient pump lowers operating costs
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
If you’re looking for a filter that packs a punch, the AquaClear 50 Power Filter is a force to be reckoned with. With an impressive flow rate of 200 GPH, this filter is not only suitable for 20-gallon tanks but can handle aquariums up to 50 gallons. What sets it apart is its multi-stage filtration system, offering mechanical, chemical, and biological filtration for unparalleled water quality.
The AquaClear 50 boasts a filtration volume that’s up to seven times larger than its competitors, ensuring maximum contact time with its specialized filter media. This includes AquaClear Foam, Activated Carbon Filter, and BioMax, all designed to keep your water crystal clear and your fish healthy. Its unique waterfall design adds a touch of serenity and oxygenates the water as it returns to the tank.
One of the standout features is the patented flow control, allowing you to adjust the water flow to meet your specific aquarium needs. This ensures that you get efficient filtration without overwhelming your fish or plants.
Pros:
- High flow rate of 200 GPH, suitable for larger 20- to 50-gallon tanks
- Multi-stage filtration with up to 7 times larger filtration volume
- Patented flow control for customizable water flow
- Comes equipped with specialized AquaClear filter media for superior water quality
Cons:
- May be too powerful for smaller or more delicate fish species
- Higher flow rate could lead to increased energy consumption
Atlantis Aqua-100 Internal Filter
- 💎 CRYSTAL CLEAR WATER – Unlike other fish tank filters on the market, the Atlantis Aqua submersible aquarium filter draws water through the bottom of the filter, rather than the sides. This means the water travels through the full fish filters system rather than taking the easiest path and being partially filtered, like other fish filters.
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
If you’re tired of constantly changing filter pads and looking for a versatile, efficient filtration system, the Atlantis Aqua-100 Internal Filter is your answer. Designed to work in tanks ranging from 20 to 100 gallons, this filter offers an all-in-one filtration system that includes both sponge and biochemical/biological filters.
What sets the Atlantis Aqua-100 apart is its unique bottom-draw design. Unlike other filters that pull water through the sides, this one draws water through the bottom, ensuring that it travels through the entire filtration system for crystal-clear results. This makes it highly effective, whether you have a freshwater, tropical, or saltwater tank.
Another standout feature is the filter’s lifetime sponges, eliminating the need for costly monthly replacements. Plus, the filter oxygenates the water, providing a healthier and more enjoyable environment for your fish to swim in.
Pros:
- Unique bottom-draw design for more effective filtration
- Lifetime sponges save you money on replacements
- Versatile use in tanks from 20 to 100 gallons, suitable for various water types
- All-in-one filtration system for comprehensive water purification
Cons:
- May take up more internal space in the tank due to its all-in-one design
- The bottom-draw system might require more frequent cleaning to prevent clogs
Aqueon QuietFlow 10 LED PRO 100 GPH
- LED indicator light flashes when water cannot pass through the cartridge, generally indicating it's time to change the cartridge
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
If you’re looking for a filter that combines high performance with smart features, the Aqueon QuietFlow 10 LED PRO is a top choice. With a flow rate of 100 GPH, this filter is well-suited for aquariums up to 20 gallons, whether they’re freshwater or saltwater setups. But what really sets this filter apart is its four-stage advanced filtration system, ensuring your tank stays crystal clear and your fish remain healthy and active.
One of the standout features is the LED indicator light that flashes when the cartridge needs replacing—no more guesswork or constant checking. The internal pump design not only ensures silent operation but also eliminates leaks and comes with a self-priming feature, making it incredibly user-friendly.
Pros:
- Four-stage advanced filtration for comprehensive water purification
- LED cartridge change indicator for hassle-free maintenance
- Internal pump design for quiet operation and self-priming
- High flow rates for better oxygenation and more active fish
Cons:
- May require more frequent cartridge changes due to higher flow rates
- The multiple stages might make the unit bulkier than some other options
Aqueon QuietFlow 20 E 130 GPH
- Efficiently cleans and filters water
Last update on 2023-09-22 / Affiliate links / Images from Amazon Product Advertising API
When it comes to balancing efficiency, ease of use, and affordability, the Aqueon QuietFlow 20 E is a standout choice. With a flow rate of 130 GPH, this filter is designed to handle aquariums up to 20 gallons, making it a perfect fit for your mid-sized tank. The filter offers a comprehensive cleaning solution, featuring mechanical, chemical, and biological filtration stages to keep your water pristine and your fish healthy.
One of the key features is its auto-start pump, which requires no priming and will automatically restart if power is interrupted. This makes it incredibly user-friendly and low-maintenance. The filter comes with a carbon cartridge for chemical filtration, a bioholster for biological filtration, and a coarse media sponge for mechanical filtration. It’s a complete package in a compact design.
Pros:
- Three-stage filtration for comprehensive water cleaning
- Auto-start pump for hassle-free operation and maintenance
- Easy to install with both hanging clips and suction cups included
- Economical choice with long-lasting cartridges that need changing only every 4 weeks
Cons:
- May not offer the same level of customization as some higher-end models
- The multiple components might require a bit more space inside the tank
Why is the filter so important?
A filter is essential for your 20-gallon tank because it is the primary system for removing waste and impurities. In a confined space like an aquarium, waste materials like fish excrement, leftover food, and decaying plant matter can quickly accumulate. These waste products cloud the water and produce harmful chemicals like ammonia and nitrites. Without a filter, these toxins would reach lethal levels for your fish.
The filter also plays a critical role in chemical balance. It removes harmful substances present in tap water or accumulating over time, such as chlorine or heavy metals. This ensures that the water remains safe and comfortable for your fish.
Additionally, the filter fosters biological filtration. Beneficial bacteria grow on the filter media and help break down harmful waste products into less toxic forms. This biological process is vital for maintaining a stable and healthy environment.
A good filter aids in water circulation, ensuring that temperature and oxygen levels are consistent throughout the tank. This is particularly important in a 20-gallon setup where conditions can change more rapidly than larger tanks.
A filter is not just an optional add-on; it’s necessary for maintaining a healthy, clear, and stable environment in your 20-gallon aquarium.
What to consider when buying a filter for a 20 gallon fish tank
The market is flooded with options, and it can be overwhelming to sift through them all. But don’t worry—I’ve got your back. We’re going to break down the key factors you should consider to make an informed decision.
In this buying guide, we’ll delve into:
- Type of Filter: Understanding the importance of mechanical, chemical, and biological filtration.
- Compatibility: How to match the filter with your tank size and the species of fish you have.
- Flow Rate: The significance of gallons per hour (GPH) in maintaining a healthy aquatic environment.
- Installation and Maintenance: What to look for in terms of ease of installation and ongoing upkeep.
- Noise Level: A noisy filter can disrupt the tranquility of your aquarium experience.
- Energy Efficiency: How to keep your tank clean without spiking your energy bill.
- Adjustable Flow: The benefits of being able to control the water flow to suit your specific needs.
Type of Filter: The Three Pillars of Filtration
When it comes to aquarium filters, there are three main types of filtration to consider: mechanical, chemical, and biological. Each serves a unique purpose, and the best filters often combine all three to provide comprehensive water purification. Let’s break down what each type does and why it’s important for your 20-gallon tank.
Mechanical Filtration
Mechanical filtration is the frontline warrior in your filter system. It captures and removes visible debris like fish waste, uneaten food, and plant matter. In a 20-gallon tank, even small amounts of such debris can quickly cloud the water and create an unhealthy environment.
Mechanical filtration uses a physical medium—often a sponge or pad—to trap these particles as water flows through. It’s essential for keeping your tank looking clean and clear.
Chemical Filtration
While mechanical filtration takes care of the solids, chemical filtration deals with invisible threats. This usually involves activated carbon or other chemical media that absorb harmful substances like chlorine, chloramines, and other toxins.
In a smaller tank like a 20-gallon setup, harmful chemicals can concentrate quickly, making chemical filtration crucial for maintaining a safe environment for your fish.
Biological Filtration
Last but certainly not least, we have biological filtration. This is where beneficial bacteria come into play. These microscopic organisms colonize the filter media and convert harmful waste products like ammonia and nitrites into less toxic nitrates.
In a confined space like a 20-gallon tank, the buildup of harmful substances can happen rapidly, making biological filtration an essential component for long-term fish health.
Compatibility: Matching the Filter to Your Tank and Fish
Not every filter is a one-size-fits-all solution, especially when you’re dealing with a specific tank size and variety of fish. Let’s explore how to ensure that the filter you choose is a perfect match for your 20-gallon setup.
Tank Size
First and foremost, make sure the filter is rated for your tank size. While it might be tempting to save a few bucks on a filter designed for smaller tanks, undersizing can lead to inadequate filtration and a host of problems down the line.
On the flip side, a filter that’s too powerful for a 20-gallon tank can create strong currents that stress your fish and disturb your aquascape. Always check the manufacturer’s guidelines for tank size compatibility and aim for a filter that’s designed to work efficiently with a 20-gallon setup.
Fish Species
The type of fish you have also plays a significant role in filter selection. Different species have different needs when it comes to water flow and cleanliness. For example, bettas prefer a gentler flow, while cichlids might appreciate a more robust current. Some fish are more sensitive to water quality and require superior mechanical and chemical filtration. Others, like goldfish, produce more waste and thus need a filter with strong biological filtration capabilities.
Knowing the specific needs of your fish species can guide you in choosing a filter with the right balance of mechanical, chemical, and biological filtration. It can also help you decide whether you need additional features like adjustable flow rates, which we’ll discuss later in this guide.
Flow Rate: The Importance of GPH
When you’re in the market for a filter, one term you’ll frequently encounter is GPH, which stands for Gallons Per Hour. This metric indicates how much water the filter can process in an hour, and it’s a crucial factor to consider for your 20-gallon tank.
Gallons Per Hour (GPH)
The general rule of thumb is to aim for a filter with a flow rate that can turn over the entire volume of your tank at least 4 to 5 times per hour. For a 20-gallon tank, this translates to a filter with a minimum flow rate of 80 to 100 GPH. This ensures that the water is adequately circulated and filtered, keeping the environment clean and stable for your fish.
However, the ideal GPH can vary depending on several factors, including the type of fish you have and the overall bioload of your tank. For example, if you have fish that produce a lot of waste, like goldfish, you may opt for a higher GPH to ensure effective waste removal. On the other hand, if you have delicate or slow-moving fish like bettas, a lower GPH that doesn’t create strong currents may be more appropriate.
It’s also worth noting that while higher GPH usually means more effective filtration, it can also lead to increased energy consumption and noise.
Installation and Maintenance: Keeping Things Simple and Efficient
there’s another practical aspect you shouldn’t overlook: how easy is the filter to install and maintain? After all, the best filter in the world won’t do you much good if it’s a hassle to set up or keep clean. Let’s delve into these considerations.
Ease of Installation
The last thing you want is to spend hours wrestling with complicated instructions, multiple parts, and specialized tools. Look for a filter that comes with a straightforward installation process. Many modern filters are designed to be user-friendly, often requiring no tools and featuring simple clip-on or suction mechanisms. A quick and easy installation saves you time and ensures that the filter starts doing its job as soon as possible, keeping your aquatic environment healthy.
Ease of Maintenance
Regular maintenance is a non-negotiable aspect of fishkeeping; your filter is no exception. Over time, the filter media will get clogged with debris and will need to be cleaned or replaced. Some filters make this process easier than others. Look for features like easy-to-remove cartridges or media trays, which allow you to clean or replace the filter media without disassembling the entire unit.
Additionally, consider how often the filter will require maintenance. Some high-quality filters are designed to run efficiently for longer periods before needing a clean, giving you a bit more breathing room in your maintenance schedule.
Noise Level
One of the joys of having an aquarium is the sense of tranquility it brings to your space. The gentle bubbling of water and your fish’s graceful movements—a peaceful oasis that a noisy filter can quickly disrupt. That’s why it’s important to consider the noise level when choosing a filter for your 20-gallon tank.
Filters come with motors, and motors can be noisy. However, advancements in aquarium technology have led to quieter and more efficient designs. When shopping for a filter, look for models that advertise quiet operation or low noise levels. Some filters are designed with sound-dampening features or use magnetic impeller technology to reduce noise.
It’s also a good idea to check customer reviews or ask for recommendations from other aquarists. Sometimes, real-world experience can provide valuable insights into how quiet a filter truly is. Noise levels can also be influenced by how well the filter is maintained; a clogged or dirty filter is likely noisier.
The goal is to create a serene environment for you and your fish. A filter that operates quietly will help maintain the peaceful ambiance of your aquarium, allowing you to fully enjoy the beauty of your underwater world without any jarring background noise.
Energy Efficiency: Good for Your Wallet and the Planet
In the excitement of setting up an aquarium, it’s easy to overlook the ongoing operational costs, including energy consumption. Filters run 24/7 to keep your tank’s environment stable and healthy. Over time, this can add up on your electricity bill, making energy efficiency an important factor when choosing a filter for your 20-gallon tank.
Many modern filters are designed with energy efficiency in mind, using advanced technologies to deliver effective filtration with lower power consumption. When shopping for a filter, look for models highlighting their energy-efficient features. This could be anything from a specially designed motor that uses less electricity to smart technology that adjusts the filter’s operation based on the tank’s needs.
Energy-efficient filters are not only good for your wallet but also better for the environment. Lower energy consumption means a smaller carbon footprint, which is a win-win for both you and the planet.
It’s worth noting that energy efficiency often goes hand-in-hand with other desirable features like quiet operation and durability. Efficient filters use higher-quality components that run more smoothly, produce less noise, and last longer, offering you better value for your money in the long run.
Adjustable Flow: Tailoring the Current to Your Tank’s Needs
While this feature might seem like a nice-to-have rather than a must-have, the ability to control the water flow rate can be a game-changer for your 20-gallon tank.
Different fish species have different preferences when it comes to water flow. Some fish, like bettas and guppies, prefer a gentler flow that mimics their natural, slow-moving habitats. Others, like some cichlids and tetras, thrive in environments with more robust currents. An adjustable flow rate allows you to tailor the water conditions to suit the specific needs of your fish, making for a happier, less stressed aquatic community.
Adjustable flow also gives you the flexibility to fine-tune your tank’s environment based on other factors, such as the presence of live plants or specific decorations. For example, a lower flow rate can help prevent soil erosion and give your plants a stable growing environment if you have a densely planted tank. On the other hand, if you have a tank with fewer obstructions, a higher flow rate can ensure that waste and debris are effectively swept into the filter for removal.
A filter with adjustable flow offers greater versatility, allowing you to adapt to changes in your tank without buying a new filter. Whether you add more fish, change the aquascape, or even upgrade to a slightly larger tank, an adjustable flow filter can be tweaked to suit your evolving needs.
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