Take a tall glass or jar put a piece of shrimp in the bottom and lean it slightly against the rock. The crab should fall in and not be able to get out. It might take a couple of days but it usually works for me.
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72 gal bowfromt mixed reef sps dominated, 25 gal mineral mud type sump/refugium Skimmerless
2x250 14000k phoenix hqi 2x96 pc actinic, 50x flow
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