Clown behavior

[rocco134]

I have noticed that one of maroons is "digging" in the sand. Is this pretty normal? He seems to be doing it near the open brain i introduced yesterday (he also used his tail to "dust" off the sand that subsequently lands on the coral)

I have also noticed him nipping (well i wouldnt call it nipping as i dont think he is actually harming it) at the open brain. he touched his lips to the coral, and the coral reacts but only for that spit second in that particular spot. Any thoughts on this?