Hygger Aquarium Sponge Filter for 20-55 Gallon Fish Tank

Why Choose This Bio Sponge Filter? 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. Additionally, it is safe and gentle enough to avoid sucking up a fish. The filter comes with two fine-hole bio sponges, one to use now and a replacement.

It is recommended to clean the sponge every 2 to 4 weeks or whenever a decrease in bubbles is observed. The tank water should be used for cleaning.

The filter container comes with a pack of bioceramic balls and can be disassembled, allowing for the replacement of other filter media as needed. It is easy to install.

How to Use? First, take the spare sponge off the filter after unpacking. Keep one sponge to restore its fluffiness and install the fixing buckles. Wash the filter to remove any dust before placing it in the aquarium. Connect the air pump and air tube (4mm) to the filter. Squeeze the sponge until it is full of water, making it sink to the bottom of the tank.

It is important to note that the air pump and air hose are not included. Due to the two sponges being squished up together, it is recommended to take the filter apart and loosen the sponge to restore its normal shape.

【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 environments, such as those for betta, guppy, shrimp, snail, and fish fry. It can also be used as a pre-filter for other filtration systems or as an auxiliary filter for large tanks.

【Working Principle】This air-driven sponge filter is powered by an air pump that uses the water-lifting effect generated by rising bubbles to drive water flow through the filter sponge. This effectively adsorbs excreta and residual bait, achieving the purpose of filtering and purifying the water quality.

【Filtration/ Culture/Aeration】The biochemical cotton has a high-density pores 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 microorganisms. Additionally, 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 sponge to be used and the other kept as a spare. The filter container is easy to detach and can be freely replaced with any other filter media as needed. To use, 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】The hygger sponge filter comes in three sizes: Small (2.9"W x 4.1"H), suitable for 1 to 20-gallon aquariums with a depth under 14"; Medium (2.9"W x 6"H), suggested for 20 to 55-gallon aquariums with a depth under 19.7"; and Large (3.9"W x 6.4"H), suggested for 55 to 125-gallon aquariums with a depth under 26.4".

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