you need to wait a week until a tank is settled, as there will be no good bacteria in the water & thats hard on the fish. You can speed up the process by adding special chemicals that have the bacteria in them. I use a chemical, that has the bacteria, conditioners & other good stuff in them. My fish have never been healthier

Mind you my fish are far larger & harder to keep & they live 10-20 years, oh did I mention they are a foot long