Great...

What is it and are they bad?

looks like a flatworm and they suck cause they either irritate or eat your coral depending on which type of flatworm.

damn.. any way to get rid of them?? some type of crab or something?

There's a nudibranch that eats them and there's also a treatment by Salifert, or as I like; $alifert since at stores you pay for the name). Anywho, it's called Flatworm eXit. I'm going to go with the treatment route since getting a nudi just to take care of some worms is out of the question.

interesting thank you

by the way...make sure you get an old batch of Flat Worm Exit...Salifert has been having quality control issues as of late

....but you didnt hear that from me

Yeah, so I've heard... something about their nitrate kits always reading 40 or something like that? I'm sure there are other things too... that's just what I've heard of it though.

Flatworm exit is fantastic, but do a water change after treatment in a nano, the poison they release when they die makes the corals sad :-( I had to treat twice for my flatworms.

haha alright i will try and find some old stuff.. i just changed my sand bed resently and moved the tank. i was pretty sure that would get rid of them but there coming back:(