The other benefit of crabs is they eat all the excess food that settles out when feeding the fish. Maybe the fish would find and eat it too, not sure as I've always had crabs in my tank. I'm sure a crab would eat a pod if he could catch it, but I'm not sure he could. I think a few crabs and snails would be a good addition to a refugium, but I could be wrong *shrug*.
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