Critter ID

[meganias123]

I've been looking up several different descriptions of what this might be and can't find a definite answer.
It is tiny and skinny, no shell that I can see, just a general "slug" shape with two protruding "antennas"; it's body is a orange-red color. Oh, and there's quite a few in my tank, crawling on the glass, being swept away in the water column, crawling amongst the rock work... So an ID or idea would be helpful.
Thanks guys!

Tank livestock:
- 3 nassarius snails
- 2 astrea snails
- 3 nerite snails
- 100+ collonista snails
- 2 turbo snails
- 1 black stomatella snail
- 1 skunk cleaner shrimp
- 1 flame scallop
- 15 ish red/blue leg assorted hermit crabs
- 2 zoanthid corals, 1 octospawn, 1 acan, 2 blastos
- clown pair
- Lawnmower blenny
- bicolor blenny
- 2 baby sw mollies
- amphipods & copapods/phytoplankton/zooplankton
- bristle worms
- Asterina starfish (in sump)
- mini bristle starfish (tons of them)
... oh, and hair alage... x-x"
................. I think that's it.

It's been probably 5 months since I have added anything new to my aquarium.

 

[Lionfish Lair]

Could be a Vayssierea sp.

Here's a link to more photos of them. Vayssierea.

 

[Roboson]

The color makes my think it's a red flatworm, but it's hard to tell in the picture.

 

[Lionfish Lair]

It has antennae.

 

[cnseekatz]

Could be a stomatella, their shells are very flat, and from that view, you'd never see it.

 

[meganias123]

Yes! The Vayssierea was exactly how they looked... wow... tubeworm predator
I hadn't really seen them anywhere for weeks after I did a water change... They were everywhere before the water change and then they were nowhere to be seen. Its now been months and I haven't seen one. I wonder if my hermits or hundreds of mini starfish could have cleaned them up? I have 2 small feather dusters that I've had for a long time and they're still going strong.