Advice? What kind of snail is this?

Limpet. I had a big one in my tank and now I have a dozen or so smaller ones.

Observe because I believe they're listed as "reef cautious" and could eat some stuff you don't want them eating.

 

I had some that skinned my poccillpora and acro colonies.


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Interesting. Did you guys actually see them eating the acros? I had lost most the acros in my tank and idk why. I have seen one of those in my tank though. Next time I see him he's gone.

 

I have those in my all SPS tank. No problems here. I have never seen them on any acros.
Are you sure they weren't eating algae on the coral skeleton? Like already dead tissue with nuisance algae growing on it.