I have a young flowerhorn that's about 3", and he's in a tank with a mirror on the back. He would attack his own reflection the first couple of days inside this tank. I don't really check up on it often, but today I found him swimming all over the tank, flopping around, swimiming upside down, playing dead (i think..), and swimming inside his rock. He would come out sometimes when I feed him, but then run right back inside his rock. He's the only fish in there, the tank is 45 gallon, and hes been in there for 3 weeks. Anyways, is this normal behavior?