Okay,

I think what you might have is Woolly worms, a larval form of the Woolly beetle. I get them sometimes and so do some other people I know of that raise roaches, lobsters included.

I didn't see any pics here but in the future this might help:

www.whatsthatbug.com

I couldn't get this sight to load but it may help ( these insects are also called Woolly bears)

http://www.allaboutworms.com/category/garden-worms/wooly-worms

Good luck, hope I was of some help,

TheVermanLady P.S. I think that they're harmless.