Spirorbid worms?

Doberman13

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Are these spirorbid worms? Just wondering if this is good for the tank or not He's growing about a millimeter every few days It seems.
 
I believe that is a vermatid snail. A spirobid is actually only about a millimeter wide and spiral shaped. Some people don't like vermatid snails, they don't really bother me.

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I'm pretty sure he came in on this frag of zoas. As long as he's not bothering anything I like it. He is growing so much, I wasn't sure because I do have hundreds of spirorbid worms on my back glass. For a second I thought they would all get this big.
 
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