Pest or friend?

I have noticed in the past few days a strange sort of orange 'thing' living in my sandbed and a few on the glass of my tank. The organisms in the sand bed are a light and dark orange banded color and are shaped like worms (long and thin). However, they don't scoot around the sand like a worm would but rather are attached into the sand bed and extend their lengths out into the water flow. I know they are not just plants by the way they can twist and curl up their 'arms'. I just noticed these today when I got home from work.
What I had noticed a few days ago was a small, maybe 1/4" long at the most, orange little dude on my glass. He moved along the glass, sticking to it like a snail. But instead of scoot along on a 'foot' like a snail, he would extend a long thin portion of his body and sort of pull himself along. At any one time, he may have multiple apendages. This guy is also orange but not banded like the things in the sand. Now that I'm looking today, I can see two of them on my glass. 
I have not seen these guys on any corals, clam, or fish. I am worried though that they may be something nasty introduced from something I got at MACNA. Unfortunately, I did not dip any of the corals I got. But again, I have not seen anything crawling/growing on anything except the sand and my glass. 
Any ideas? A picture is pretty much impossible because my camera is lame and won't focus on the sand or anything on the glass. I'll try googling for a picture but haven't come up with anything so far.
Please let me know if you have any idea what this may be.
Thanks,Kylie

 

I'm looking up spaghetti worm and it seems that's what they are. They match a lot of the pictures. If they are ok, then I'm not concerned. The only thing unfortunately I've found about them is sometimes they can make softies angry by touching them to make them not open their polyps. Haven't seen any near my corals though.

Is there anything else important you think I should know about a spaghetti worm? Can they hurt my clam's foot at all by being in the sand bed?

Is there any way these could be baby bristle worms? If so, how can I get rid of them? (I DO NOT want bristles). I'm not seeing any sort of bristle on them though.

 

This is a very close match. Mine don't seem to have as long of tentacles and are more flowing in the current instead of sticking to the sand but this matches color and shape

http://www.notlehs.com/reef/salt6/spagworm.jpg

 

Lol well I have orange!!

As for bristles, they just freak me out. Had a run in with a giant bristle worm and my middle finger. Let me tell you it is greaking scary to not know you have one in there and then pull you finger put to see it completely covered in bristles. It took me forever to get all of them out. Ick

 

That is very good to know