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Why do you say no to Lionfish or puffers? I have done it multiple times with no issue.
All I have ever used is cupramine. I have learned the hard way with wrasses in the past, but I used in on my lions and puffers.
IMO; There are some species of fish you never want to use copper on: Sharks, rays, lionfish, puffers, seahorses, dragonets. Basically, no scaleless or prehistoric fish.
And there there are angels & wrasses which you can use copper on, but you should raise it very slowly (4-5 days). Actually, raising copper slowly is a good idea no matter what fish you are treating. Only go from zero to full therapeutic with copper when faced with Marine Velvet Disease, as the risk from that disease outweighs the danger of immediate copper exposure.
I have had difficulties with lyretail anthias and cupramine.Tangs should be fine with copper, I believe anthias too.
Go slow and monitor with a test kit.

