It is important to replace your filter sponges from time to time, as these will eventually get clogged with fish waste, and material from the tank. You can clean these, but eventually nothing will do but a new sponge.

This is an important piece of your filter, as it not only removes waste particles from the water before it is returned to the tank, but it is also a home to colonies of bacteria that provide you with a healthy tank for your fish to live in.

• One replacement filter sponge