Biological filtration in your aquarium is essential for bacteria to break down ammonia, converting them to nitrites, which further break down to less toxic nitrates. | Simply put, a biofilter keeps your tank water healthy by breaking down organic and inorganic waste. This biological filter offers 3 functions, it circulates the water, is an internal filter and biofilter. | The pump and filtration material are included and it can be used in freshwater and marine tanks. | | * Biological aquarium filter | * Keeps water clear and clean | * 3 functions | * Circulates water | * Biofilters waste | * Internal filter | * Size: Small
