I found the little discus and it looked disintegrated so I did a 50% water change. I'll keep an eye on the fish and see if there's any behaviour changes. I always count my fish when I feed them and they're always there so unless they came out but didn't actually eat, I don't know. The bigger one looked visibly sunken. I won't be adding any meds, just doing more frequent water changes. The only thing I did differently was waited a whole week before doing the last water change so maybe that was it? I'll keep my eyes on them.