Easy-to use biological filter for tropical aquarium fish Aquarium filter sponge for efficient biological filtration
The open-celled foam provides a huge surface area for bacteria to colonize. 
The bacteria breaks down ammonia and nitrate, making the aquarium water safe for fish to live and breed.
Operated by air pup and supply additional oxygen through the air bubbles to the aquarium. 
It is ideal for aquariums up to 300L, breeding and haching as it will not trap nor harm them.