hygger Sponge Filter for Small Aquariums, Submersible

【Aquarium Filtration】 The sponge filter generates water flow by passing air through the pipe in the center of the sponge, purifying the water by attracting dirt to the sponge and cultivating beneficial bacteria for filtration. The circular concave structure expands the filtration area and increases filtration efficiency.
【Increased Oxygen】 An air stone is built into the sponge, and when connected to an air pump, it provides abundant oxygen and gentle water flow, improving fish comfort. (Note: Air pump and 4mm air tubing are sold separately)
【Quiet/Safe】 The water flow from this submersible filter is gentler and quieter than other filtration filters. Because there is a sponge at the water inlet, small, weak creatures such as fry and baby shrimp will not be sucked into the filter. Also, since it is installed inside the aquarium, there is no risk of water leakage.
【Regular Cleaning】 All parts of the filter are removable and can be easily assembled and disassembled. Two reusable sponges are included. We recommend cleaning the sponges once every 2-4 weeks, or when the bubbles decrease. (To prevent damage to beneficial bacteria, rinse them by kneading in aquarium water drawn from the tank to maintain water permeability.)
【Ideal for Small to Medium Aquariums】 This filter is compact, measuring only 6cm x 7cm x 8cm, and will not interfere with your aquarium's layout. It is ideal for small aquariums under 40cm, and can be used as a supplementary filter for larger tanks. It is particularly suitable for low-flow applications such as fish breeding, shrimp, snails, and clams.