Ive had my other flameback for over a year and I was out of town for two weeks and decided to leave my flameback with a fish store which was a huge mistake. After I got it back a few days ago I noticed both sides of the gills are red. I was told it could be ammonia burn, but I’m not sure. He was like this when they have it to me in the bag, but he’s still eating/moving well. It’s been 4 days since I’ve gotten him back