Welcome to TR!! Glad to see ya posting!!! And congrats on your star!! w0000t!!
I agree with them and not use
copper based treatments unless the fish is in a
QT. You can't use
copper in a reef tank. Once you do, it never comes out since the silicone in the seals of your tank absorb it and it will leach into your system, hence is why freshwater tanks treated with
copper ick medications can't be converted over to reefs.
Keep in mind that clowns are apart of the damsel family- they are hardly little suckers. Usually they can fight it off without problems. You can also do RODI dips with your clown which could help. Get a small tubberware container *u guys call it tubberware on the other side of the river??

* and add about 1-2 cups of RODI and let the fish swim for about 5 minutes.
You can also soak their food with garlic which supposedly helps build their immune system.