you can just wash everything with fresh water and let it dry. after it will dry you can start everything over again, nothing will servive after that. also i wanted to tell you that when you buy fish, don't get it right away, but wait for a week and right before you get it get somebody to feed the fish to see if it has healthy apetite. make sure that fish has nothing strange on his eyes or body. healthy fish are spotless. i've been practicing it since the first time i lost all my fish. it has been some time since i had problems with fish, even though i got few new onse. this will save you money and headaches of loosing fish.