Black spot on Montipora

[Rconner15]

Hi all! I noticed a dark spot on my montipora a few weeks ago. I'm not sure if it's something to be concerned with. Whatever it is, it doesn't seem to be progressing quickly. Could this just be new growth? Or is it some kind of pest I need t worry about?

 

[ashr]

Looks like a v.snail. You can just break it off :)

 

[Rconner15]

Looks like a v.snail. You can just break it off :)

Can I ask what a v snail is?

 

[Scorpius]

vermatid snail.