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Maybe in the wild,but in captivity if cuc is eating a fish chances are pretty good that something wasn't right(sickness,ilness bacteria,or the unfortunate reality of natural selection...believe it or not I've had more problems with emerald crabs(one 6$ crab killed a 300$wwcog bounce frag by crawing on it and fighting another one to the death expelling the mushrooms guts made me mad then he got up in my toadstool and ticked it off for a week needless to say I dont keep emerald crabs in my system anymore despite their beauty and usefulness,lately I've been a fan of the porcelain and the arrow crabs,the arrows are good but only for 1 per every 40g(maintain a frag tank or grow out tub)I would be looking into a wrasse(halichoeres, melanarus, leopards, etc, any hunter type wrasse) before an arrow crab. Arrow crabs are known to eat sleeping fish. Not their fault really, they are after all just crabs that are opportunistic feeders.
And by the accounts on these forums, and countless others, they would disagree with you about arrow crabs.Maybe in the wild,but in captivity if cuc is eating a fish chances are pretty good that something wasn't right(sickness,ilness bacteria,or the unfortunate reality of natural selection...believe it or not I've had more problems with emerald crabs(one 6$ crab killed a 300$wwcog bounce frag by crawing on it and fighting another one to the death expelling the mushrooms guts made me mad then he got up in my toadstool and ticked it off for a week needless to say I dont keep emerald crabs in my system anymore despite their beauty and usefulness,arrow crabs are good but only for 1 per every 50g(maintain a frag tank or grow out tub)
Maybe in the wild,but in captivity if cuc is eating a fish chances are pretty good that something wasn't right(sickness,ilness bacteria,or the unfortunate reality of natural selection...believe it or not I've had more problems with emerald crabs(one 6$ crab killed a 300$wwcog bounce frag by crawing on it and fighting another one to the death expelling the mushrooms guts made me mad then he got up in my toadstool and ticked it off for a week needless to say I dont keep emerald crabs in my system anymore despite their beauty and usefulness,lately I've been a fan of the porcelain and the arrow crabs,the arrows are good but only for 1 per every 40g(maintain a frag tank or grow out tub)