I have had lots of practice hunting for crabs. what I find has worked best for me is I went to princess auto and picked up a 12 inch long pair of forceps they will be able to lock on to the crab as the little buggers can hold on to the rock like you wouldnt imagine. I wait till all the lights are out in the tank and the room is dark then have a look around with my trusty flash light with the red lens. I have pull many crabs from my tank with this method.
Come to think of it it is about time I go on a crab hunting expedition again
Hope this helps and happy hunting
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