A fairly new crab for us the Blue Dart Crab (Geosesarma Sp) is in the same family as the Purple Orchid Crabs or Vampire Crabs (another very cool crab). I have found that these are very resilient crabs therefor making them extremely easy to keep. The are an omnivorous crabs but prefer anything “meaty”. Super low maintenance just needing a small amount of water and land so they may travel back and forth. The best set up for these guys would be an aqua-terrarium with plenty of plants and moss and hiding places.  They are social crabs and can be kept together without too much trouble.  An all around awesome looking crab that’s super easy to keep...what more could someone ask for.... ;-)