I think the fish needs to be left alone too. At some point, the money is not worth is, especially when you think of it from the perspective that if it will only stay alive with all the medication, then it'll be a very expensive. I think you need to remember that he's going to have to be strong enough to sustain his health, and medicating him is weakening his immune system, so he's less likely to be able to fight off anything in the future.