If you dismantle your freshwater tank to use as a saltwater tank, what do you need to do? If it were the other way around I imagine you'd want to wash the tank out thoroughly to get rid of the salt, but I dunno about freshwater to saltwater. Do you need to disinfect it? I don't know if bad bacteria that's possibly in the tank from freshwater fish could pass to saltwater fish? Do they get the same kind of ich, for instance?