Hey this past week has been horrible for me, all my fish have died from Ich except for one, the "sucker fish" he does not have any white dots on him and i dont think he's infected. I have him in a separate fish bowl and right now i'm trying to disinfect my large 55 gal tank. I've put almost boiling water in my tank 3 times now full water change and i tried to clean through all my silica sand and gravel. my tank is split half sand half gravel. Do you think all the Ich has been killed from my tank and can i start fresh with new fish? What should I do with my "sucker" fish if i put him in the new tank will he contaminate it? Thanks for the help guys and gals!