my Oscar,was starting to get hole in the head,but that was caused by the useless undergravel filter,yes I cleaned it,but was it even worth having it?No its not worth it,if we have better technology for our fish tanks,to run 20x better than what it was 20+ years ago.After getting rid of it,treating it a fish protector for the skin,ect.it healed up just fine,since I caught it so early.Also a good food brand,to check out is the hikari bloodworms,it has multi vitamins in it,so that will also help out,with your new O's.