If you desire to have more in your crabs' tank other than just sand, dishes for water and food, additional shells, a sponge, and a calcium source, here are some cage decorating ideas that you might like to consider.

Live plants make a great addition to the cage and will provide the crabs' atmosphere with new oxygen. Make sure they are not poisonous or have pesticide residue. Also make sure that the soil they are in does not contain Styrofoam, as this is dangerous for a hermit crab.

Consider using an aquarium paper background scene around your crabs' tank. Not only will it enhance the look of their cage, but your crabs will be less nervous and feel more cozy.

Provide your crabs with something to hide in. Rock caves or tree log huts can be found at pet stores.

Provide your crabs with fun things to climb. Choya cactus wood makes a safe climbing toy because it is full of holes. It gives off an unpleasant odor when it is wet, so keep it dry.

Store-bought dried sea plants are parasite-free, fun for crabs to climb, and are a great source of vitamins.

Dried moss is fun to chew and hide in. Buy it from a pet store so that it is parasite-free. Keep it dry to avoid bacteria growth.
Simplicity is sometimes best. This elaborate terrarium may be beautiful, but it is difficult to remove the hermit crabs for their weekly bath. Furthermore, molting hermit crabs cannot be sufficiently monitored in this setup.