I know the methods of meds, hypo, etc. however my fish all croaked and I do believe its from lack of O2 in the tank. Bc many of the fish that have died did not have any signs of ich yet. So what I want to do is break the tank down wash the subdtrate filter media soak my live rock in freshwater for a few days then add some saltwater TLC. And add some fish shortly there after. Will doing this work or should I just go fish less for a few weeks. My daughter is wanting to know where dory and nemo are and I want this back up and running ASAP!!! Thanks



