I have a question about quarantining. Back in the early 1980's I don't believe there was such a thing. I must have been pretty lucky because I lost very few fish. Anyway, my questions is I am setting up a 20 gallon QT and am wondering if I should just observe the fish (1 tomini tang, and 2 pearlscle butterflys) or should I do the copper power treatment as a preventative. Some people say just watch and if you don't see any issues for 4 weeks you should be good to go. I have also read many people who say to use the copper treatment. Just wondering what others say. I have 3 clowns, a pajama cardinal, and a sailfin blenny in the D.T. Thanks for any help Mark