I've got a clownfish who's losing color and a wrasse that I haven't been able to see very often because he would dive in sand and hide. My clownfish looks like he's losing color but I don't know what he has. Unfortunately it looks too late for my yellow wrasse because he laying on the the sand, is pale and his fins are little torn from when he was bagged. I have a separate tank but it doesn't have a sump and uses a canister filter. Will it be okay if I transfer them to the other tank use copper to dose? I only have 3 fish in my tank and was also wondering if should put the other fish in their to get treated in case it has something.