Normal Ocelaris Clown Behavior??

[sk8boarder]

I recently bought two B/W ocelaris clowns... my larger one seems to be making erratic movements and going down to the sand bed and rubbing its side. Is this normal clown behavior??

P.S The one that is acting weird was put in recently put into the tank after one of my other clowns died. I dont know if they are paired yet

Thanks