The addition of nitrifying bacteria requires the water to stand still for a week before the flora can be established. If fresh water is added every day, it is impossible to establish flora, so the landlord will wait patiently for a few more days.

There is a small remedy for treating protein worms, which is to put some copper in it, copper coins or fifty cents coins. The substance produced after oxidation can kill the protein worm, but copper should be taken out immediately after insect removal, otherwise it will have a bad effect on the fish.