Unfortunately, nothing to be done without knowing what the fish's problem really is. I think you're dealing with a mixed bag of problems. You've addressed the MI, but there is something else going on.
Unfortunately the coral beauty passed away.Now the porcupine is acting wierd. Usually shes very personable and eats alot ,today she very lethargic and didnt eat much. I have no idea how she can just suddenly turn so quickly.She hasnt shown a single whitespot since about 4 weeks ago in the main tank and has been very healthy prior to this spitting water at me everyday I open the lid and had an aggresive appetite.
Done another 60% water change,rinsed the filter hopefully she gets better overnight.