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I am curious about this, because I did see in a thread someone saying they saw a ruby red crab (related species to the emerald crab) straight up grabbed hold of a fish while it was alive: https://www.nano-reef.com/forums/topic/236781-emerald-crab-keeps-killing-my-clown-fish/Emerald crabs do not hunt fish. If they eat a fish, the fish was dead or minutes from being dead. I have dealt with hundreds of these crabs.
Crabs get a weird reputation in this hobby because people are quick to assume they are a culprit because someone else saw them eat something dead and assumed it must have killed