What the heck is this?

[robbyville]

Hi all,

About midnight last night while walking by the tank I saw this worm type thing stretched across the front pane. By the time I got the camera it was on the sand and looked like it was finding a hiding place.

It's about 2.5 inches long, and orange in colour. Please tell me this is not a flat worm. Is this anything bad? It pretty much caught me by surprise as I do not have any very new stock and this was the first time I have ever seen this thing!

NB, sorry for the fuzzy picture, no time to adjust the camera. And yep, I'm working on the algae problem still

Thanks as always!

Rob