That is the worst discus I have ever seen. Poor little guy. Thanks for rescuing him, he has a chance with you! Because of the really poor shape of his entire body and those eyes, I would definitely start with a combination of maracyn and maracyn 2. They are not harsh antibiotics at all. He's got nothing to fight with in his condition so those meds will do some fighting for him. If all he wants is a few bloodworms, by all means give them to him. If he gets better and stronger he can eat flake later. At least a few bloodworms in his tummy will give him a bit of strength.