So I have 8 pea puffers in my 55 gallon, which will get more plants soon, and most of the pea puffers are doing amazingly well. There’s a few fair sized ones and the rest are pretty small but there’s one in particular that’s worrying me. I got 2 at first because that’s all my lfs had and 6 more later on. I know as a fact the really skinny one is from that group of 6. It’s not bullied, there’s actually 0 aggression in the tank like rarely even a chase, and I offer them frozen blood worms, frozen brine shrimp and live pest snails twice a day but it barely accepts those and instead likes to pick on the biofilm on my driftwood and I’ve always read that they’re pure carnivores. I kinda doubt it’s a parasite since the store I bought them from is one of the best I’ve ever found (always quarantine and medicate the fish in a back room before putting into the sell tanks and a few fish have been there for like 2 months so they obviously take care of the fish) but it’s always a possibility. The most likely thing I can think of is that it’s because the 15 gallon it was in before I moved it to the 55 got a little nasty and was growing brown and blue bacteria/algae and that puffer is still recovering. I know exactly why that tank was nasty btw so they’ll be fine in the 55 gallon. Either way any tips on helping it recover?