When my clowns have stopped eating from infection or other stress I have always had to try a wide variety of foods to get them eating again..
Live brine, Cyclopeeze, small mysis, anything that is small and I can get my hands on.. I always think smaller food works better when the fish isn't eating or hasn't eaten in a while.
He is not going to die from not eating in the next couple of weeks. Get some Nutrimar Ova in the meantime.
Mixing antibiotics with copper is fine.
Agree.
Prazi is also OK with Cupramine. Probably ok with Coppersafe (but never tried it.) Prazi, Cupramine and Maracyn II is also ok IME.