Hmm.. Saxat från liveaquaria: The hardy Emerald Mithrax Crab, also known as Emerald Crab or Emerald Mythrax Crab, has a shiny green, flat, compact body and hairy legs. It requires a mature aquarium with plenty of rock work and hiding places. The Emerald Mithrax Crab eats algae and various types of meaty items it can scavenge. It can be harmful to small fish, but unlike many other animals, it will eat bubble algae and is useful for cleaning tanks of this potential problem. They are an opportunistic feeder, and if food is not available to them, they may turn to supplementing their diet with corals or invertebrates. If there is insufficient algae, their diet should be supplemented with dried seaweed, chopped meaty items or a quality pellet food. Där ser man..