Anyone have any idea what this might be. He has pop eye and his gills are permanently flared. Edit: he’s not mine. I work in a pet store and I noticed him in the isolation tank that we keep in the back. I’m assuming he was in a cup that they’re usually sold in and that’s why he’s not doing well. The tank he’s in now is 80 degrees Fahrenheit. I haven’t gotten a chance to do a water test in the current tank.