[Sk8r]

HOpefully you will not buy a huge one, so he will be ok. Add some wide-gauge pvc elbow or the like so he has something to hide in. Don't use lights. Dim light and quiet will reassure him.

Of all fish to rush qt on, a tang or angel is not the one: they are incredibly disease prone---ich, velvet, and several things I have trouble spelling.

Never medicate a well fish. First, if you've medicated for ich and velvet shows up, that's two different meds, so you have already weakened your fish by the treatment, and now you have to switch treatments, which may take days---to purify your water of one so you can go to the next. Second, especially with copper, it is marginally less lethal to the fish than to the ich parasite: it will save the fish's life, but at the cost, probably of a few months of life, or worse: there is sometimes kidney damage to the fish.

Do not rush to treat specific diseases until you are rock-solid on your diagnosis. Being wrong can cost you days and further weaken the animal.

Go to the Fish Disease forum while your guy is languishing in qt and learn to recognize specific diseases, and memorize the appropriate treatments.