The Puffer Forum

Hello,
It's been a while since my last post here. For about two and a half weeks my three Amazon puffers, Huey, Dewey, and Louie, have been in my 36g system. Prior to that, they were quarantined and treated with Prazipro, and I made sure each was healthy and eating. Yesterday, when feeding mysis to my fish, I noticed Huey has developed a cloudy and somewhat inflamed eye. There are also white marks on his side, so I assume he was fighting with and got bit by the other pufferfish. All three are still swimming and eating normally, though Huey seems even more skittish than his normal self. I did a 50% water change just to correct possible issues in water quality. Today, Huey's eye still looks cloudy and inflamed, and I am wondering if I should start dosing melafix next. What is the best course of action? Should I treat the whole tank, or move Huey back into quarantine, with the risk of stressing him more?

Just some extra info:

36 gallon bowfront planted tank, with six serpae tetras, a juvenile acara cichlid, and a couple sun loaches. None bare much aggression.

I feed bloodworms, snails, mysis, flakes (more for the tetras and cichlid, though the puffers aren't afraid to nibble at them), and Repashy's grub pie. There are also scuds in the tank but I don't know if the puffers eat or even notice them.

I haven't made any changes since they've entered the tank, short of upgrading the light to a Fluval Aquasky.

The tank has been up and cycling for years (it used to be an mbuna tank but was slowly transitioned towards a planted community).

I will post params later if that helps.