Slug of some sort?

[adittam]

What is this? Looks like a snail without the shell, or vaguely like a gray terrestrial slug. Is it reef safe?

 

[adittam]

Better picture after plucking it off the rock and dropping it on the sand. It can move pretty quick. Moves just like a snail.

 

[EeyoreIsMySpiritAnimal]

Does it have a small, iridescent shell? If so, it's a stomatella snail.

 

[adittam]

Does it have a small, iridescent shell? If so, it's a stomatella snail.

Yes! Good, bad?

 

[EeyoreIsMySpiritAnimal]

Yes! Good, bad?

Very good!
Be warned though, they have a natural defense mechanism that lets them "drop" their tail... Kind of like a lizard. The tail will die, but before it does, it waves around like it's alive, probably to distract a predator while the snail escapes. Really weird to see and freaked me out the first time I tried to pick one off a rock and it happened, lol.

 

[adittam]

Just found another thread about them, that’s definitely what this little hitchhiker is. Thank you!