You find a jar and put the sand in it. The thickness of the sand is based on the thickness that can bury a hermit crab. Put a fresh water basin and a seawater basin in the tank. Seawater can be prepared from sea salt. Find a small spray bottle and spray it into the cylinder from time to time every day to keep the humidity. They can only breathe in humid air, and the general humidity should reach 60%-80%. Salt cannot replace sea salt, and water can be mineral water, boiled water or tap water. Remember to expose yourself to the sun or let it stand for a few days before use. If you don't understand, you can go to TB Guantianxia flagship store to find a pet.