acro eating snail

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this snail is eating my acro's can any one help me .thank's for any help you can give me.

 

[DarkXerox]

I've seen these on some maricultured corals that come into the stores. If I remember correctly it is some type of whelk, perhaps someone else can elaborate.

 

[clkwrk]

I had found one that looked like that but white. It was eating a frag.