Today I came home from and found my 6 inch queen angel stuck in the rock work . Removed the rock and the angel just started floating around sideways trying to swim and floating on and off to the top. Died within 2 hrs. The fish was perfectly healthy this morning and eating outof my hand. No marks on the fish either. All other fish are fine. Tested the water everything in good parameters. Had the angel for 4 months in my reef tank. Anyone have any ideas what may have happened?

