What is this?

Travis

Friends, help me identify this little animal. I've been observing it since the very beginning, but I couldn't catch it. Now I noticed it crawled onto the glass, and I caught it. What should I do with it next?

Marie

naked snail, scrap.

Christopher

and what can he do?

Diana

There is an article on desirable and undesirable species in marine aquariums on Reef Central.

Jason

Here is what they replied on RC.

Marie

Looks like Pericelis sp. - a netted worm. I don't think it's worth killing it; separate it and observe or put it in a tank.

Stephen

I have already disposed of it; I think it's his doing, eating the stomatels, as there were many shells found around his habitat.