Weird worm in DT

[anaya]

While checking on my newly acquired eel at night with the lights out I have noticed a super long transparent green worm. It stretched about 12-15" through rock-work and within literally 10 seconds of light coming on withdrew into the rock it was coming out of. I have seen it now a number of times always going into the same rock. No pics as of now but I will continue to attempt to get a few.

Any clues?

[Dung MVP]

In my case I have seen a creature looks like centipede 10cm long, you know how I feel at that time, took out that live rock and get the creature out, dry it well for a week then put it back.

[Sugar Magnolia]

Ribbon worm maybe? Have a look through here - http://www.chucksaddiction.com/hitchworms.html