Blue Shadow Ninja Crab (Lepidothelphusa sp)Blue Shadow Ninja Crab is a small, colorful amphibian crab native to Java, Indonesia. Blue Shadow Ninja Crab can be kept in groups. They can be kept in all water, but need to maintain a high level of oxygen or water current. They feed on meat and live in small groups of 6 8 individuals, mainly at night.*Note: Ninja crabs are prone to break their legs due to logistics, tension or fighting, they will grow back after shelling, don't worry. Don't worry.