one of my black and white clowns got brook about a week after i bought him..the only thing you are doing with the dips is stressing the fish, and that causes his inmune system to be low..what i did with my clown was, set a hospital tank, had the salinity at 1.015, and treated with formalin for about 2 weeks, i added 2 drops of garlic to his diet, which was high in protein and vitamins, the garlic opened up his appetite, the protozoan disappeared in 5 days, but i waited one more week to put him back in the tank, he got fat and healthy after that period of time..UV sterilizers are good, some people say they dont do anything but i differ, i havent had anything bad happen to my tank, virus wise..lol..ever since i set 1 up..good luck