I would read everything you could on the effects or affects of the meds on invertebrates and corals. I would be too scared of causing more damage to the other inhabitants or lasting problems on the tank itself. I live by the philosophy that the strong survive - it might just be part of the healing process that the CBA has to go through. I have had some fish live through bad stuff and find that a general rule is if they are eating well they can usually pull through. Check and double check before you add it to your tank