Nippy Clownfish?

[SkiFletch]

Hey guys, I'm just wondering if any of you have ever had clownfish become nippy towards corals? I've lately noticed that my clowns have become very nippy towards my elegance coral and both my favites and open brain corals. I first noticed the behavior almoast a week ago with the elegance. I thought at first that the little guys were trying to host in it, but as I watched further and noticed the coral getting more and more stressed, it seems that they were in fact nipping a couple parts of it. So I pruned my cheato and banished my clowns to my 15 gallon refugium. I figued that a pair of Ocellaris are much easier to replace than the coral. They've been chillin down there for a day now. Is this a common behavior to clowns? I've been lead to believe that most clownfish never nip at corals, but here mine does. Ironically its just the female that does it, I've never caught the male in the act.

What do you guys think I should do? Leave them in the sump for a week and see if they can be re-introduced? Or should I go beg Randy and Jason to let me do a trade-in.

Just in case anyone's wondering, chemistry is:
Temp 83
pH 8.0
sg 1.026
Ammonia, nitrite, nitrate, phosphate all 0
Calc 420ppm
Alk 10dKH

So no obvious problems on the chemistry front. All other fish are fine and dont nip (Bar Goby, Fairy Wrasse, Diamond Goby, and even the Flame Angel). And the clowns show no interest in my other corals (mushies, gsp, hammer, paly's, zoos, xenia, bubble, yellow fiji, and frogspawn.

Anyway, your experience and oppinions are valued as always.