What is this invert?

[mudjawd]

Hi all. Got this as a hitchhiker in one of the frags I got. What is this critter? Please advise.

 

[blaxsun]

It's a slug of some sort...

 

[bushdoc]

It doesn't seem to move much, judging from those photos, so I would say it is definitely slug(g)ish.

 

[ISpeakForTheSeas]

Looks like a Dermatobranchus sp., but I'm not entirely sure which one. My best guess would be Dermatobranchus diagonalis, but - regardless of species - if it is a Dermatobranchus sp., it's not reef safe (they eat octocorals - softies, gorgonians, GSP, etc.).

Some other (at least sometimes) relatively similar species:
Dermatobranchus striatus
Dermatobranchus caesitius
Dermatobranchus dendronephthyphagus
Dermatobranchus earlei
Dermatobranchus funiculus
Dermatobranchus phyllodes

 

[mudjawd]

Thanks. I saw it on my clove polyps in the morning . I’ve removed it and hoping it didn’t lay eggs already