[header] How to look after pet crabs [title] Fill the tank with about 1/2 to 1 whole centimeter (or more) of sand or coconut substrate. [title] Place the crabs in the tank once you are home. [title] Fill the two bowls with crab food and water. 
[step] Do not use tap water; use non-chlorinated water. [title] Leave them for a bit of time to get used to the area (choose a warm place and don't move them too much).