Inverts eating coral skeleton

[Gman83]

Hey all,

I have an inverts that is eating one of my frogspawn's skeleton. Which ever it is, it's like a beaver chewing through a tree.

Here is a picture of the coral some time in the first month of getting it:

It is the top frogspawn (the blue and green). Mostly a full skeleton except where it was dragged.

Here is a close up of it today:


I dipped the frags before placing it in the tank. I've narrowed it down to a Halloween hermit or my pencil urchin. Those are the only non-snails I have. I've had thr urchin for a while (9+ months) so I'm more inclined to believe it the crab. However, saw the urchin on it last night, and this morning there are new chew marks.

I know it's not a fish, as only have two clowns, a midas blenny, and a tomini tang at the moment.

My question, regardless of which it is how can I get it to stop? I don't want to come home, or wake up to the polyps face down in the sand because something chewed through it.

CA: 480
Po4:.08
No3:10
Alk: 8.9
Salinity: 1.025

 

[Michael71]

Maybe remove the offender or both to the sump for now to give it time to heal up