This crawled out of my live rock

Nancy

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Any idea what this is? I'd think a nudibranch, except that it has a kind of shell on the front. I'm giving you all the first chance at IDing this critter. My concern is also how large it will get.

Nancy
 

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Stomatella snail most likely. Harmless. They reproduce well and Kalypso found them mighty tasty as a youngster.

 

Nancy

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Thanks to both of you! I'm just as glad it's a snail, and come to think of it, it was eating algae when I spotted it!

It's already about an inch, so maybe it's full grown.

Doesn't show up in the photo, but it's shell is a beautiful irridescent pearl, slighly purple.

Nancy
 

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