1.The fish tank internal filter provides effective filtration and increases the oxygen level to ensure a clean tank environment. It features fine cleaning effect, quietness and easy maintenance. Fit for shrimp, fry and various ornamental fish like betta, discus, guppy, and goldfish. 2.The sponge traps waste particles mechanically and cleans the water without trapping baby fish. It keeps water clean and clear. 3.This fish tank internal filter is the water pump internal filter for aquarium, which integrates oxygen, filtration and water circulation. It uses energy saving and large flow motor, which is more efficient, and can effectively absorb the residue at the bottom of fish tank. The new generation of energy-saving technology, ultra low energy consumption, small noise light sea water universal long service life reasonable structure and easy disassembly, cleaning, maintenance convenience.