10 Best Filters For 20 Gallon Fish Tanks [2025]
This post contains affiliate links. As an Amazon Associate, we earn from qualifying purchases.
Finding the best filters for 20 gallon fish tanks can be a daunting task, especially with the multitude of options available on the market. The right filter is crucial for maintaining a healthy aquatic environment, but sifting through countless reviews and specifications can be overwhelming. To simplify your search, we have meticulously shortlisted 10 top-performing products based on efficiency, user feedback, and price. Our curated list aims to save you time and hassle, ensuring you choose the ideal filter for your tank with confidence.
Top 10 Filters For 20 Gallon Fish Tanks In The Market
Filters For 20 Gallon Fish Tanks Review
- Compatible with Aqua-Tech EZ-Change # 2 Aquarium Filter,fit for 10-20 power filters
- Easy to use,easy to replace
- Package: 10 pcs 10-20 gallon fish tank filter
- REPLACEMENT CARBON FILTER: Keeps aquarium water crystal clear – removes odors and discoloration.
- CATCHES DEBRIS: Dense, dual-sided mesh filters debris and fish waste.
- FITS TETRA WHISPER WATER FILTERS: Color coded to make it simple to remember which replacement cartridge size to purchase.
- CONVENIENT: Replacement filter cartridges are fully assembled and ready to use.
- USAGE: Change monthly or sooner if needed.
- 🐟 25% MORE ACTIVATED CARBON - Aqueon Replacement Filter Cartridges are dual-sided, featuring dense-floss with over 25% more activated carbon than the leading brands.
- 🐟 HIGH-QUALITY ACTIVATED CARBON - The cartridge contains high-quality activated carbon that keeps water clean.
- 🐟 EVEN CARBON DISTRIBUTION - Aqueon’s patented cartridges were designed to ensure the even distribution of activated carbon.
- 🐟 EASY INSTALLATION - Simply rinse under cold water and easily install using the "FRONT" orientation tab.
- 🐟 MULTIPLE SIZES AVAILABLE - Aqueon Replacement Cartridges are available in X-Small, Small, Medium, and Large.
- Perfect Fit: The ammonia remover pads are compatible with Aqueon QuietFlow 10 LED PRO, SmartClean 10-20 Gallons Power Filter/HOB Filter.
- Improve Water Quality: These filter media pads reduce ammonia spikes and toxic buildup in fish tanks promoting a healthy aquatic environment for fish and plants.
- Easy to Use: The mini filter pads are pre-cut for hassle-free installation or quick replacement.
- Premium Material: These ammonia reducer strips are made of resilient fibers and the density is designed to maximize the surface area that allows water to flow through while trapping harmful and unwanted free-floating debris and particulates.
- Includes: 12 pcs of Ammonia Reducer Pads (Note: Please rinse it thoroughly with cold water before placing it in filter)
- 💧Application - Aquarium filter cartridge compatible with Aqua-Tech EZ-Change #2, replacement for 10-20 gallon aquarium power filters
- 🐳Fast, Clean & Easy - Coarse floss can remove large particles, premium activated carbon can trap dirt, removes impurities, and the molded ribbed back has offer maximum water-to-carbon contact
- 🐋Easy To Install - Switch out in less than five minutes, simply remove the older and dirty filter and change in seconds just shake and rinse
- 🐬Long Lasting - The aquarium filter is washable and reusable ensuring long life. Replace the filter every 2 to 4 weeks for optimal performance or 10 to 12 times per year depending upon usage
- 🐟Content - 6 pack of 10-20 aquarium power filter. Size : 4.5*4.7*6 inches
- 【Compatibility】: 12 pack Aquarium filter cartridge compatible with aqua-tech ez-change # 2 aquarium filter,fit for 10-20 power filters.size : 4.5 x 4.7x 6 inch
- 【High quality Activated carbon】：Activated carbon can prevent odor, water discoloration and impurities from your aquarium,provide clean and fresh water for healthier fish.
- 【Strong adsorption】：Contains premium activated carbon, which can capture fine particles or dust in the water,removes the odors, water discoloration and impurities
- 【Easy to install】:Easy to use,easy to replace and no need assemble,changes in seconds just shake and rinse.
- 【Reusable】: The aquarium filter is washable and reusable. It is recommended to replace it every 2-4 weeks to ensure that the water quality of the aquarium is clear.
- INCLUDES CARTRIDGE: The molded ribbed back maximizes contact with water – includes premium activated carbon.
- BIOLOGICAL FILTRATION: Bio-Foam biological filtration removes toxic ammonia and nitrites on contact.
- QUIET: Decoupled motor with dampeners reduces noise to below 40 dB.
- POWERFUL: Impeller and motor assembly designed for efficient power usage filters 10- to 20-gallon aquariums 5 times per hour.
- SLEEK DESIGN: Designed to fit standard aquarium hoods and canopies, the Aqua-Tech Ultra Quiet Power Filter makes aquatic filtration easy.
- 【#3 Aquarium Filter Cartridge】Fish filters for aquariums large. Size : 5.3*5.7*6 inches. 10-pack fish tank filters fits for aquarium filters 30-60 gallon, 20-40 gallon fish tank, 50 gallon fish tank(EZ-Change#3), fish tank filter 60 gallon aquarium and also compatible with filter Rite-Size C fish filters (for Penguin PRO Power Filters 200 275 350 375
- 【Efficient Adsorption】Fish filter can make sure that the 30 gallon fish tank of water is clean and the fish are healthy.Fish and turtle tank filter are made of thickened filter spray cotton and contain enough high quality activated carbon, which can strongly absorb particle of dust in water and prevent them from recirculating
- 【10 Pack fish tank filters】Compatible with rite size c filter cartridges contain premium activated carbon that can remove odor, water discoloration, impurities, and any toxins that may hurt your aquarium! So this small fish tank filter can help you solve 20 gallon fish tank filter and 30 gallon fish tank filter of filtering problems
- 【Easy to Replace】Aquarium filters 30-60 gallon / 20-40 gallon fish tank are easy to change. Just make sure your filter is 20-40/ 30-60 gallon power filters - 50 gallon fish tank; 55 gallon fish tank or 30 gallon fish tank. And for best results, change every 2-4 weeks, no messy assembly required, changes in seconds just shake and rinse
- Buy fish filter cartridge with confidence. Brand names and/or trademarks are used here only for product description or identification of devices and/or device types. Errors reserved
- REPLACEMENT MICRON CARTRIDGE: Provides excellent filtration for a clean and healthy aquatic environment.
- COMPATIBILITY: Fits all Marineland Magnum Canister Filters, including H.O.T. Magnum Canister Filters.
- WATER POLISHING POWER: Removes fine debris to leave water crystal clear.
- WASHABLE: Thoroughly rinse with tap water under pressure; never brush or machine wash.
- MARINELAND FILTRATION PRODUCTS: Count on Marineland brand for the most reliable, technically advanced aquariums and accessories on the market.
- 【Package Includes】: 9 pieces of fish filter cartridges, compatiable with AQUA-Tech 20-40 & 30-60 power filters (EZ-Change#3) & Marineland Penguin PRO Power Filters 275/375 & Original Penguin Power Filters 200 350 - Rite-Size C.
- 【Full filtration】The filter cartridge has dense filter cotton, which can adsorb all kinds of debris and fish excrement, and the grid design of the fish tank filter cartridge makes full contact between the activated carbon and water to achieve maximum deodorization and water purification, thus giving your lovely pet a fresh and comfortable living environment, and also saving you the time of manually cleaning the fish tank.
- 【Ready to use】Our filter cartridge is already set up, it just needs to be installed correctly on the power filter and it is ready for quick filtration. If there is carbon on the filter cotton, please clean it before use.
- 【Easy to replace】: you can replace the old fish tank filter cartridge without the help of tools. After many tests by our engineers found that the adsorption of activated carbon is limited, it is recommended to replace it in 2-4 weeks to keep the best effect.
- 【Friendly Service】: As a brand seller, we will be responsible for your purchase and promise to give you a two-year warranty from the date of purchase. If you have any problem in understanding or using our aquarium filter cartridge, please don't hesitate to tell us and we will try our best to help you.
Our Review Process
To ensure you get reliable product recommendations, we follow a detailed review methodology that includes:
- Market Research: Scanning best-selling and trending products in this category.
- User Feedback: Reviewing customer reviews, star ratings, and complaints.
- Hands-On Testing: Trying select products ourselves when feasible.
- Feature Comparison: Evaluating specs, durability, pricing, and safety.
- Expert Opinions: Consulting with niche experts or credible reviewers.
We independently select the top 10 options based on value, quality, and usability. To learn more, visit our detailed review process.
Key Considerations Before Buying Filters for 20 Gallon Fish Tanks
1. Type of Filter
There are several types of filters available for fish tanks, including hang-on-back (HOB) filters, canister filters, and internal filters. Each type has its own advantages and disadvantages. For a 20-gallon tank, a hang-on-back filter is often a popular choice due to its ease of installation and maintenance. Canister filters, on the other hand, provide excellent filtration but may be more complex to set up.
2. Flow Rate
The flow rate of a filter is crucial for maintaining water quality. It is generally recommended that the filter can turn over the entire volume of the tank at least 4 to 5 times per hour. For a 20-gallon tank, look for a filter with a flow rate of 80 to 100 gallons per hour. This ensures effective filtration and helps keep the water clean and clear.
3. Filtration Type
Filters typically employ a combination of mechanical, biological, and chemical filtration. Mechanical filtration removes debris and particles, biological filtration supports beneficial bacteria that break down waste, and chemical filtration removes impurities and odors. Ensure the filter you choose has all three types of filtration to maintain a healthy aquatic environment.
4. Size and Design
The size and design of the filter should fit well within your tank setup. Consider the space available and how the filter’s dimensions will affect the tank’s aesthetics. Additionally, some filters may come with adjustable flow rates or unique designs that can help in reducing noise, which can be beneficial in maintaining a peaceful environment.
5. Maintenance Requirements
Filters require regular maintenance to function effectively. Before purchasing, check the ease of access to the filter components for cleaning and replacing filter media. Some filters are designed for easy disassembly, while others may be more complicated. Consider how often you are willing to perform maintenance when selecting a filter.
6. Noise Level
Noise can be a significant factor, especially if the tank is located in a living area. Some filters can be quite noisy, while others operate quietly. Look for user reviews or product specifications that mention noise levels to help ensure that the filter you choose will not disrupt your home environment.
7. Cost and Durability
Price can vary widely among filters, so consider your budget. However, remember that a higher initial investment may lead to lower maintenance costs over time. Additionally, look for filters made from durable materials that can withstand the aquatic environment and last for several years.
8. Compatibility with Tank Inhabitants
Different fish species have different needs when it comes to water movement and filtration. If you have delicate or slow-moving fish, a filter with an adjustable flow rate is ideal. Research the needs of your tank’s inhabitants to ensure the filter is compatible with their requirements.
FAQs
What size filter do I need for a 20-gallon fish tank?
For a 20-gallon fish tank, you typically want a filter that can handle at least 5 times the tank volume per hour. This means you should look for a filter with a flow rate of at least 100 gallons per hour (GPH). However, it’s often recommended to choose a filter with a higher capacity for better water quality and filtration efficiency.
What types of filters are suitable for a 20-gallon aquarium?
Several types of filters are suitable for a 20-gallon aquarium, including hang-on-back (HOB) filters, canister filters, internal sponge filters, and submersible filters. HOB filters are popular for their ease of use and maintenance, while canister filters offer superior filtration for heavily stocked tanks.
How often should I change the filter media in my 20-gallon tank?
Filter media should be replaced or cleaned regularly to maintain effective filtration. Generally, you should rinse sponge and foam media in tank water every 4-6 weeks during water changes and replace activated carbon or other chemical media every 4-6 weeks, depending on the manufacturer’s recommendations and the bioload of the tank.
Can I use a filter from a larger tank on my 20-gallon aquarium?
Yes, you can use a filter from a larger tank on your 20-gallon aquarium, as long as the flow rate is appropriate for the size of your tank. Just ensure that the filter’s output will not create excessive water movement, which could stress your fish.
Do I need a filter if I have a planted 20-gallon tank?
While it’s possible to maintain a planted tank without a filter, it is generally not recommended. A filter helps to keep the water clean and oxygenated, which is beneficial for both the plants and fish. In a planted tank, consider using a gentle filter to avoid disturbing the substrate and harming delicate plants.
How do I maintain my filter for a 20-gallon fish tank?
To maintain your filter, regularly check for clogs and clean the filter media as needed. Rinse mechanical media in tank water to avoid killing beneficial bacteria, and replace chemical media according to the manufacturer’s guidelines. Additionally, ensure the impeller and other components are free from debris to keep the filter running efficiently.
What are some common issues with filters in 20-gallon tanks?
Common issues with filters in 20-gallon tanks include reduced water flow due to clogs, noise from the motor, and poor filtration leading to water quality problems. Regular maintenance and cleaning can help prevent these issues. If you notice persistent problems, consider whether the filter is appropriately sized for your tank.
Can I run multiple filters in my 20-gallon tank?
Yes, you can run multiple filters in your 20-gallon tank to enhance filtration and water circulation. This can be particularly useful in heavily stocked tanks or when keeping delicate species that require optimal water quality. Just be mindful of the combined flow rates to avoid excessive current.
Are there filters specifically designed for 20-gallon tanks?
Many filter manufacturers offer models tailored for aquariums around the 20-gallon size. Look for filters labeled for “up to 20 gallons” or “20-gallon tanks” to ensure they meet the tank’s filtration needs. These filters are designed to provide adequate flow rates and efficient filtration for the size of the tank.
The Bottom Line
In conclusion, selecting the right filter for your 20-gallon fish tank is crucial for maintaining a healthy aquatic environment. The ten products we have highlighted in this article were chosen based on a combination of factors, including filtration efficiency, ease of maintenance, noise levels, and customer reviews. We also considered the specific needs of various fish species and plant types that you may be keeping in your aquarium. By evaluating these filters through a comprehensive lens, we aimed to provide you with reliable options that will best suit your tank’s requirements.
By following our curated list, you can make an informed decision that not only enhances the clarity of your tank water but also promotes the overall well-being of your fish and plants. Investing in a quality filter will reduce maintenance time, improve water quality, and create a thriving habitat for your aquatic life. Whether you are a novice or an experienced aquarist, these filters can help simplify your tank management and ensure a vibrant underwater community. Happy fishkeeping!
