How did you acclimate him?
I wouldnt say that this is "usuall" behavior for a happy, healthy, clown that is comfortable in its environment. My clown swims all over his 24 gallon tank and is very comfortable now, but he has been in there since July. I would say your clownfish is probably just getting used to the tank. He might even be intimidated by the other fish so make sure they arent bullying him into the corner or anything.
Also, is your clownfish eating?