Well my scat fish today has been swimming upside down, on its back, all day in a corner. We tried to move him and he freaks out and kicks sand everywhere then finds a corner again and just keep "swimming towards it". He is breathing very fast. Been like this most of the day. Cleaned the filter and did a half change on water. No other fish seem sick. We have eels, dragon fish, bala shark fish, rose fin shark, and a few little guys. Here is a video(s)
Sick scar fish
Tank when they are all happy
Sick scar fish
Tank when they are all happy