Every time i've seen a fish do this, it has been a precusor to marine
ich. Is he eating well? Are his eyes clear? keep a close eye on him
for the next couple days, checking for fine white powdery looking spots
on his body.

or then again, maybe he's just lonely and is getting it on with
rockwork in the tank?

Good luck.
malto

Mike Lawford wrote:
Hi All,

My regal tang has recently taken to rubbing his chest against everything he
can - as if there was some kind of irritation there but I cant see anything.

Any ideas what this could be?

~m