Snail/Slug/Nudibranch? You call it!!!

[richserpe]

Hi all

Found this guy creeping around my tank after lights out. He's about 1/4" long. On the glass. He's a very pretty yellow and has two protrusions on his head and no shell. I have Astrea, Marginella, Nassarius and Turbo snails and a few small conches. This guy is a newcomer that hides during the day. I was thinking Stomatella and hoping for a nudibranch but he's not "flowy" like a nudibranch. Any thoughts?

 

[Crabs McJones]

Elysia Sp

 

[richserpe]

Thank you. I'm going to call him a good guy and keep him around since he's an algae eater. He just got drafted into the CUC. Let's hope my gigantic Red Mithrax Crab doesn't find him.