WHat is this?

[lochi]

Just noticed this thing.

 

[bdhough]

Looks like either a limpet or a sundial snail. Is he cone shaped, does he have a distinct point at the top of the shell? If yes he's the limpet otherwise he's the sundial.
Limpet are sometimes known to eat corals. Most times they just eat algae. I woudln't worry about him unless you see him eating your corals.
Sundials WILL eat zooanthids. I've seen it first hand. If you ever want zooanthids get rid of it. Otherwise i read they will die off without any zooanthids to eat.

 

[xrayman]

Thanks for that pic i have been wondering what that was in my tank forever have not had any problems with mine.Great pic

 

[bonermeister]

Keyhole limpet?

 

[lochi]

it's cone shaped and its been in there with zooanthids. I havn't noticed any of them getting mowed down some I'm going with limpet. Thanks

 

[bonermeister]

If it is hanging out in your zoos keep really close tabs on it. I could be wrong.

 

[bang guy]

It's a Keyhole Limpet. They have been known to scrape the top layer of flesh from Leather Corals. I've never heard of them eat Zooanthids.

 

[nm reef]

I gotta agree with Bang...looks like a keyhole limpet to me also.
Check this link for a very good pic and some info.

nmreef@cox.net

 

[bonermeister]

Thanks for the back up Bang and NM, I didn't feel confident enough to say for sure.