color: blue Size: 14.515.54.7cm, 7.519-29cm, 1119-29.5cm material: plastic Weight: 180g, 210g, 310g feature: 1. Aquarium sponge filter provides mechanical and biological filtration - captures floating debris and protects your small fish from being sucked into the filter, aerobic bacteria colonize the sponge providing bacterial material to facilitate nitrogen cycling. 2. The aquarium sponge filter has two media containers, each container has a ceramic biological filter media inside, which helps to remove harmful substances and increase the oxygen level in the tank, you can change the filter media to improve the water quality. 3. Double-layer 7-layer ribbed sponge design to quickly build up biofilters and extra oxygen, two sponges mean a larger surface area, which is conducive to the colonization of beneficial bacteria and faster circulation, making your aquarium crystal clear. 4. Easy to install: Just install the air pipe into the device and turn on the air pump, a good way to
