I was doing searches for tips on controlling the ich in my tank and I was reading on this ufc-5 stuff mentioned above, I know nothing about the product but by reading what the company has to say about it and the reference to humans taking it @ $5 an oz. I'll bet that it is Colloidal Silver,found in any health food store, I myself take silver and had even wondered about treating the fish with it because it's perfectly safe,it's just a germ-bacteria destroyer (I'm a germ freak) But then I thought about how it would destroy my friendly bacteria too.....hmmmm it's interesting!