Please identify my hitchhiker!

[rhyan]

I just got some new corals and this guy showed up. I think he might be some sort of sea slug. Are these good or bad?

 

[shollis2814]

OK, I am not 100%. Please wait on confirmation, but I think that's from the Scutus genus. That white stripe is a reduced shell.

 

[Lionfish Lair]

You're right!

 

[rhyan]

Cool! Thanks for the ID! I'm assuming they're reef safe...

 

[Lionfish Lair]

It's an herbivore. Only issue is they can get kind of big.