heehee....
What I did was starve my shrimp for about 2 weeks...
I cut off the neck of a 20oz coke bottle, made slices down the sides a little ways into the neck and folded the flaps in..
Poked some holes in the top and ran fishing line through it and poked a few other small holes in it, filled it with some food and lowered it into the tank.
Within 30 seconds, i had both peppers and both cleaner shrimp IN the bottle. was pretty funny too!
This works well for fish too, especially if you condition them by leaving the bottle in there for days while you are there to watch it. They just go hmmmmm.