The most suitable water depth for cultivating ornamental crabs in fish tanks is just above the back of crabs.

Attention should be paid to raising crabs in fish tanks:

1, it is best to use a covered fish tank to prevent crabs from escaping. You can plant an aquatic plant in a fish tank and put some pebbles and sand to simulate the living environment of crabs in the wild more realistically. Pay attention to the stone sticking out of the water, let the crab climb up to bask in the sun and have a rest.

2. Feed crabs with bread crumbs, potato chips, steamed bread slices, rice, snails, small fish and shrimps;

3. Change the water once a week, and it is best to use natural tap water, such as river water and lake water. If there is no running water, it can be replaced by running water that has been dry for two days;

After the crabs are shelled, they should be fed separately from other crabs.