I had a bad outbreak of ich and after asking the same questions, decided to just do regular water changes and let the situation ride itself out. Well, my tank doesn't have anymore ich but I had a pair of Onyx clowns, a rhomboid wrasse, pink margin wrasse, scooter blenny, clown fish, and a balteatus wrasse perish. The funny thing is that the blue tang, the guy who started it all, ended up making it and is thriving in my tank. I think having a QT tank is definitely the way to go, even if it means breaking your tank down.
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