I was trying to catch my cleaner shrimp before I did a red bugs treatment. Inverted pop bottle which it sounds like you've tried. Just make sure it is wedged in a way that it slopes into and touches the rockwork. The worms will need to be able to go right from rock to bottle I think. I caught one of my massive ones but no shrimp.
For some reason I decided to toss it back in... I'm sure they cleanup well for a tank. My only regret was aimlessly tossing it back in. Landed on my favia and left a bunhc of bristles in its tissue for a few days.
Good luck!
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