Hygger Aquarium Filter for 20-55 Gallon Fish Tanks

Why Choose This Bio Sponge Filter? This air-driven sponge filter is powered by an air pump that uses the water-lifting effect generated by rising bubbles and drives water flow through the filter sponge, effectively adsorbing excreta and residual bait to achieve the purpose of filtering and purifying water quality. First, it constantly supplies oxygen and provides good surface agitation for the fish tank. Second, it provides a dual filtration system, bio & sponge, to keep the water clean while being safe and gentle enough to avoid sucking up a fish.

The filter came with two fine-hole bio sponges, one to use now and a replacement. It is recommended to clean the sponge every 2~4 weeks or whenever you see a decrease in bubbles, using the tank water for cleaning. The filter container can be disassembled, allowing you to freely replace other filter media as needed.

To use the filter, first take the spare sponge off and keep the other to restore its fluffiness, then install the fixing buckles. Wash the filter to remove dust before putting it in the aquarium. Connect the air pump and 4mm air tube to the filter, then squeeze the sponge until it is full of water, making it sink to the bottom of the tank.

【Precision Double Filtration】The hygger sponge filter consists of a circular bio cotton and a chamber base with bio-ceramic balls, providing both mechanical and biological filtration for your aquarium. It is suitable for low flow breeding like betta, guppy, shrimp, snail, and fish fry, or as a pre-filter for other filtration systems, and can also be used as an auxiliary filter for large tanks.

【Filtration/Culture/Aeration】The biochemical cotton has a high-density pore structure, which can more easily catch impurities and particles in the water. The filter chamber is equipped with bio-ceramic balls that help break down waste and cultivate beneficial bacteria. A small bubble stone at the bottom can effectively increase the dissolved oxygen content in the water and generate a lot of bubbles.

【Use & Maintain】The fish foam filter includes two sponges, with one being the spare. The filter container is easy to detach and can be freely replaced with any other filter media as needed. Hook the filter up to an air pump, and squeeze the sponge until it is full of water, making it sink to the bottom of the tank. The sponge should be washed approximately every 2-4 weeks (using tank water) to ensure the filter works properly.

【Three Size For Choice】Small: 2.9"W x 4.1"H, works well for 1 to 20-gallon small aquariums with under 14" depth. Medium: 2.9"W x 6"H, suggested for 20 to 55-gallon medium-sized aquariums with under 19.7" depth. Large: 3.9"W x 6.4"H, suggested for 55 to 125-gallon aquariums with under 26.4" depth.

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