So today i was looking flr my fire angel and i couldnt find him so i did some hunting and he was stuck behind a rock against the tank wall so i removed a couple rocks to loosed him, but he wasnt actually stuck just floating upside down at a 45 degree angle bellyup....i gently nudged him and he swam a little akwardly- upright at first and slowly transitioning to vertical....then he swam into a secluded corner and slowly flipped vertically where he is sitting right now...he also swims upward to maintain position, but whats wrong?? I had water checked (few days ago) and everything is ideal with nitrate a tiny bit over 0 but nothing to worry. None of the other fish seem troubled or hurt....and didn't fight they even swam around together.