 Aquarium Filtration is an essential part of good aquarium practice. Aquarium Filtration comes in many different types and sizes. The most simple type is the internal aquarium filter. This method of aquarium filtration requires placing the whole filter into the tank and running the powercord out of the aquarium to the socket.
The most common form of aquarium filtration is the external filter. This is a large canister with a pump built in which sits under your aquarium and has one pipe for drawing the water and another forreturning it. This is an excellent form of aquarium filtration as it is easy to clean and adds to the volume of water in the aquarium.
Under Gravel Aquarium Filtration used to be common place but with the price of superior filters greatly reduced it has become fairly redundant. | 
