You have to be careful how you word things because some people only read what they want to see. I once mentioned that I sometimes use Clorox to treat NSW and have used Clorox to purify water in an old system that was full of ick, velvet, chartruse, Godzilla Larvae etc. Then "before" I put the fish in I eliminate the Clorox with chlorine remover and wait a few days until the scent leaves and I am good to go. Someone wrote to me saying I killed all his fish because he followed my instructions and added a cup of "Clorox" to his tank "full of fish". His fish died. I am sure they died fast but had a nice fresh scent. I mean, really! is it me? Would you add Clorox to a tank full of fish? Even if my name was Jacques Cousteau and I swore on a stack of bibles that it was safe, would you do that? I mean, if you are that stupid, you should not have fish. As a matter of fact, you should not drive or be allowed to reproduce. I also said another method of killing parasites in a tank with no fish, would be to put in a few heaters and raise the temperature to 102 degrees. He probably made chowder. Like Duh!