I have a 6 gallon cube with a small pajama cardinal (he will be moved to a 55 when he gets bigger), some hermit crabs, 5 different corals, and the subject of this thread a emerald crab. I had a peppermint shrimp, but I believe the emerald crab got him. I also believe that the crab has start eating on the corals. I feed brine shrimp once a day and one krill about one time a week, with plenty of algae for him. I just want to see what everyone thinks about keeping an emerald crab or a shrimp. I really like the emerald crab but I don't want him to keep eating my hermit crabs and corals. If you think a shrimp what kind would everyone recommend?