About a month or so ago, I put 3 emerald crabs in my tank too get rid of bubble algae.They haven't really done much in that regard.Before I put the crabs in there would always be 2 peppermint shrimp that would come out of the during feeding time,and 2-3 smaller ones I could see at night with a red colored flashlight.Now the crabs become active at feeding time,and I have only seen 1 of the big shrimp once I check ed the tank a few nights in a row and have seen none of the smaller ones. I guess my question is do emerald crabs eat peppermint shrimp? Thanks Andy