I don't think that's an emerald crab, too fuzzy (emeralds are smooth). It's not a good crab but there's no way it's responsible for a tank of dead fish. You have something else in there. Yes, I would be setting a trap. I'm thinking mantis or larger crab.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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