Best Aquarium Filters & Pumps — Up to 20 Litre + Budget (2026)
1 aquarium filters & pumps matching capacity “Up to 20 Litre” + price “Budget”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our How to Care for & Maintain Your Aquarium Filters & Pumps guide.
Looking for a reliable and affordable filtration solution for your smaller aquarium? This selection of up to 20-litre budget aquarium filters & pumps provides essential circulation and biological filtration, perfect for beginner aquarists or those maintaining nano tanks. These pumps are designed to efficiently oxygenate the water and remove waste products, creating a healthier environment for your fish and invertebrates. We’ve curated a range of options focusing on robust performance without breaking the bank – ideal for keeping your compact aquatic ecosystem thriving.
#1 Pick
NICREW Fish Tank Filter, Internal Aquarium Filter for Small Tank, Coldwater or Tropical Aquariums, Up to 20L, Black- Up to 20 Litre
£11.89
Pros
- Detachable spray bar doubles as a wave maker or surface oxygenator
- Five suction cups keep it firmly in place, mountable horizontally or vertically
- Budget-friendly option that is still one of the best-reviewed small filters on Amazon UK
Cons
- Only suited to smaller tanks up to 20 litres
FAQ
What kind of fish are suitable for an aquarium using these filters?+
Most small, peaceful freshwater fish are well-suited to tanks filtered by these pumps. Consider species like neon tetras, guppies, or small plecos – always research the specific needs of any fish before adding them to your tank.
How often do I need to clean the filter?+
Cleaning frequency depends on stocking levels and water quality but generally, a partial water change (around 25%) combined with cleaning the filter media every 2-4 weeks is recommended. Overcleaning can disrupt beneficial bacteria colonies.
What type of filter media should I use?+
These filters typically utilise sponge or ceramic rings as their primary filtration media, which are great for mechanical and biological filtration. Ensure you replace this media regularly to maintain optimal performance; check the manufacturer's recommendations.
Are these pumps quiet?+
While all pumps generate some noise, many of the models in this budget range are designed for relatively quiet operation. However, prolonged use at higher speeds will naturally increase the noise level – consider placement carefully.
How do I connect the pump to my aquarium?+
Most pumps feature a simple suction cup or clip system for attaching them to the side of your tank. Ensure the connection is secure to prevent the pump from detaching and disrupting water flow.
What’s the power consumption like?+
These filters are designed for low energy usage, typically consuming around 1-3 watts. Check the individual product specifications for precise wattage details before purchasing to manage your electricity bill.
Can I use these pumps with a heater?+
It's generally not recommended to run a heater and pump simultaneously as this can strain the motor of the pump, reducing its lifespan. If you require both, ensure adequate cooling for the pump.
What’s included in the filter set?+
Each set typically includes the submersible pump itself, often with various flow rate settings, plus a suction cup or clip for attachment to your aquarium and sometimes replacement filter media or instructions.
Are these filters suitable for planted tanks?+
Yes, many of these pumps can be used in planted aquariums. However, consider the pump's flow rate – higher flows are beneficial for plant health but may require additional filtration to manage nutrient levels.
What if the pump stops working?+
Refer to the manufacturer’s warranty information for details on repair or replacement options under Amazon's standard returns policy. Please check the product listing for specific warranty terms and conditions.