Something on snail- ideas?

[joed77]

Hey team.
6 month old red sea nano tank (120L). Introduced some starpolyp a couple of weeks ago for context.
had turbo snails for months.
today noticed this on one of them (it’s definitely alive!)
Any ideas? Should I remove snail?

 

[CoralB]

If it was me ,I’d remove it til I found out what it was .