Looking to transfer new fish to an old very established bare bottom tank that has fake rock and only fish in it. My new firefish has ICH which means my blue spot and blenny also have ICH. So the question is can I turn my old tank into a quarantine tank? It has an established bacteria and I’m guessing copepod/amphipod population so copper will kill all of that. I would like to dose the two clownfish in that tank as well which will prepare them for the new tank. Plan is to keep all fish there until a 76 fallow period of the new tank. Any thoughts on turning an old running established tank into a fish only QT? Will I be risking too much of a ammonia spike from the die off from meds?