When breeding small sand crabs, a glass jar filled with sand should be used as a vessel, and 0.4% salt water should be poured into it. Feeding management: feed the little sand crab once a day, put the food on the sand surface and let the little sand crab eat by itself. It is worth noting that it is necessary to provide scattered light for the little sand crab, and the depth of the fish tank should be kept above 15cm.