Aquarium INTERNAL POWER FILTER 1. Internal submersible filter for aquarium tank 2. Biological filter sponge,active carbon box, Aquarium INTERNAL POWER FILTERDescription: 1. Internal submersible filter for aquarium tank2. Biological filter sponge,active carbon box, each filter comes withoxygen funtion3. 1 to 4 filter- layers for options4. Fit for 18L-270L aquarium tank5. One of the most full-range ...