The way I did it was to dip my rock into hyper-salinated water. I made a
bucket of water that was about 1.040 (or higher) salinity and dipped each
rock into the bucket. The shrimp tried to get out of the water, and
ended up in the bottom of the bucket. He shot right out of the rock
within seconds of dipping the rock. This also won't kill your coralline,
unless you leave the rocks in the water for a long period of time..

HTH.

Bill.

wrote:

Im about to transfer my contents into a bigger tank. Whats the best
way i can get rid of mantis and pistol shrimps out of my rock without
damaging the good things in my rock..