Fish tank filter white cotton

If it is biochemical filtration, white cotton can't be washed often. Generally, you can check once a month to see if there are any food residues that digestive bacteria can't decompose, such as barley worm shells, which can be fished out manually. Filter white cotton is the most abundant place for nitrifying bacteria because there is the most food, and so on! The back end of the filter is the weakest part of nitrifying bacteria, so it is suggested that white cotton should not be blocked and need not be cleaned. You can pay attention to the fact that the top white cotton in the fish tank (bio-filtered) of a fish shop or a friend's house is black and dirty, but the water is very clear. It is suggested that white cotton should not be washed regularly, and the water in the fish tank should be changed regularly, for example, 4 servings per week (1). You can do it according to your fish tank capacity, fish culture density and pollution degree.