What kind Of worm?

[Alexio84]

Does anybody know what kind of worm it is?

 

[James M]

vermetid snail

 

[Alexio84]

Does a shot of calcium hydroxide helps?

 

[Justin Cook]

Yep or crush the shell. That's one of the larger species and I always take the coral pliers to them when I see them. They can put out one heck of a slime web and really annoy coral. The smaller one's I only take out if they're annoying a specific coral but those bad boys get eliminated ASAP.