What in the world?

[Valkyrie]

Saw 2 of these critters in my 55g. What is it?

 

[Lionfish Lair]

It's a Dorvilleidae. They're cool.

 

[Paul B]

I was going to say water buffalo, but I think Lionfish may be more correct.

 

[Valkyrie]

It's a Dorvilleidae. They're cool.

Thanks! Ever since I've been fallow I've had so many critters appear. Bristleworms, Stomatellas, etc. Now this Dorvilleidae, such interesting coloration and one was nibbling on a piece of something.

 

[Lionfish Lair]

This one is a little easy to pick out in a lineup because of those white dot-like markings down their back. I've had them myself and I remember thinking "Huh! THAT doesn't move like a bristleworm!!".