Betta Fish Filter Aquarium Internal Filter for 2-15 Gallon Fish Turtle Tank Biochemical 3 in 1 Oxygen Air and Submersible

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【Crystal Clear】Reduce the number of tank water changes. Aquarium air pump, filtration, water pump 3 in 1 small filter. Suitable for a variety of aquariums, like fish tank and turtle tank. 【Fish Frolic Happily 】Waterfall-style design, a superior aquarium water environment not only increases oxygen, also makes the fish feel like playing in a natural waterfall, making the fish very happy and energetic. 【Easy to Maintain】No need to replace the filter sponge. Rinse the filter sponge and pump with clean water every 1-2 weeks to maintain the filtration effect. (Note: The filter body must be completely submerged in water at all times.) 【Wide Apply & Low Noise】The lowest usable water level is 2.3 inches. Please choose according to your own needs. This aquarium filter also can be used as a turtle tank filter. The filter's sound is 20~40 dB, and only the sound of water is heard. This filter cotton does not need to be replaced. Every 1-2 weeks, disassemble the filter, take out the filter cotton, wash the filter cotton with water and squeeze the filter cotton.