Looks more like a black limpet. Look that up. Doesn't look like a stomatella.
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Thanks-I just looked it up.....some mixed feelings about whether it is reef safe. Have found info that they eat sponges and algae but another reefer had all his mushrooms eaten.....will keep researching this one.
I think they're beautiful. My LFS had some for sale a few months back but same as you, I'd heard mixed reviews on their eating habits and if various corals were involved. But they're awesome to look at!