ID black snail?

Projecttrinh

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Hello, can someone tell me if this is a good guy or bad? Just saw it when lights are out.

a5ea4020177bbcf347bebbc77bfda6f2.jpg
 
If it's a keyhole limpit they are known to eat coral tissue.

Limpets
Several different genus and many species make up the snail-like invertebrate family, commonly known as limpets. Limpets have an oval, laterally compressed shell that tapers to an off-centered blunt point. Limpets have a tiny hole at the crest of their shell where it becomes a point, which they use for waste and water exchange. Many of these species have a very large mantle that extends around and covers the shell. In fact, some limpets can be very beautiful with amazing colors, and make a welcome guest in an aquarium that does not contain SPS corals.

The most common variety encountered in a reef aquarium is the Keyhole Limpet. They are a common import with live rock, and are typically colored in a mottled brown, black and tan pattern, and do not have a mantle that covers their shell. The Keyhole Limpets are typically half an inch long, or smaller, and feed on unwanted filamentous algae, cyanobacteria, diatoms and even hydroids. Unfortunately, in the SPS aquarium, they will also feed on the tissue of SPS corals.

As with many of the snail species, it is best to physically remove the limpet if you are unsure of its species and diet. Some limpet species are herbivores and are beneficial to even a reef aquarium. But even the herbivores can become harmful if there is not enough food for them in the aquarium. Limpets will typically not reproduce to any significant number in the aquarium, and physical removal is usually a sufficient control for the SPS coral aquaris
 
+1 Looks like a Stomatella to me, They are a great addition to cuc, I have them in both my tanks and I have never seen them touch coral. KEEPERS IMO
 

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