I introduced a Percula Clown to my aquarium a few days ago but it just keeps swimming laps around the surface and won't even think about coming down to the bottom and find an anemone. I had thought it was cause of the other large fish, but I had moved them to a temporary tank to see what would happen. Still just swims laps at the surface. Could it be afraid of the coral banded shrimp that is always out or is this normal behavior when new to the tank?