Sea Slug (?) ID please

[brokeaquarist]

My tank is fairly new (5 months) and is starting to colonize with all kinds of critters.

What's this slug/nudibranch guy? From what I could tell I couldn't find any ID or clue what he is. He's absolutely adorable and would feel bad if I had to vacuum him away.

 

[KJ]

Look like Dermatobranchus sp.