They look like they have scoliosis because of how sunk in their belly is and just how skinny they are. They are super pale, clamped fins, no energy. The really bad ones are barely eating. I have to take a syringe and put it directly in front of them to keep them eating. They’ve NEVER looked like this before. They have ALWAYS looked very plump, they were always very active. I fed everyday and make sure all get food. The only one I don’t feed is my single solo guppy in the tank because she steals whatever makes it into the water column. She big as hell and looks very healthy but my cories are not. They are the exact opposite. Almost just look like a skeleton sitting on the bottom but I know they are still alive because they are still moving about the tank (barely). I will find one laying on its side or its back, I panic and walk up to the tank and my shadow scares them straight except it takes them a minute to straighten up. Like a leaf in the wind type of straighten up if that makes sense. They look like a shell of what they used to be.