So my tank broke out with marine velvet a few days ago. The fish are in a 90G mixed reef and we’re getting ready to be transferred to a 220 (had bought two new fish for new tank, when in busted a seal and now all fish crammed in 90 while I had 220 repaired). 220 over 1/2 full now. My plan is to use 220 as a qt bc it’s empty, and I’m not going to fill all the way. I was going to use cupramine, but need to use coppersafe so I can use prime to battle ammonia since daily wc on 220 isn’t possible. Can puffer and eel tolerate treatment? Am I missing something? Puffer and eel show no symptoms of illness. Have lost 2 fish already. 3 other fish show signs, but still eating. TIA!