I have a pecula clown that has been swimming vertical for about 5 days. Stays in the corners of tank away from flow current. Have had it for about 5 months. Only have another clown and yellow wrap in the tank with some like rock which have been in there for a year or so. (The rock). All the fish have been fine for months. I have been fighting with red slime and have treated the tank for that a few times but they seemed fine after the treatments. It acts like it wants to eat but can't. Please help!!