Wow! that was a quick reply!
Looks like a little shrimp or something, but not quite?
I also noticed what looked like a piece of chaeto (my chaeto sheds...if that's normal) that had come loose and was next to the glass and kind of wedged between some rock....basically stuck. it was approx. 1/4 inch long, green like my cheato but had what looked like an umbrella at the end....kind of like the filter feeding crabs. It was just sitting there so I decided to get rid of it and when I touched it, it kinda shrunk up and was more stuck to the glass than I thought. I'm thinking some kind of worm, but I destroyed it trying to get it out so, sorry no pics........any ideas on that one? I searched the web for some kind of pic but came up empty.