What is this?

[SaltyCrew4u]

Acropora frags aren't glued and I'm still rearranging the tank. Noticed this purple object near the base of a frag. Sorry for the poor picture quality. Not sure if I should be concerned.

 

[DrkNMighty]

Kind of looks like a vermetid snail

 

[AydenLincoln]

Vermetid snail which are bad pests. You can super glue the opening shut but most people can’t avoid them.

 

[Solo McReefer]

Pop it like Dr Pimple Popper