Your hermit crab will need lots of places to hide. One of these hiding spots could be a broken ceramic pot, which you could pick up from a garden center or a pet store.  You should disinfect it first with a mixture of two parts dechlorinated water and one part hydrogen peroxide.  Since hermit crabs are scavengers, they may hide food between little cracks in your decorations. Be aware that this can cause mold. Sweep through the substrate every few days to check for buried food. To allow your hermit crab to move to a new shell, you should add three large shells. Hermit crabs love housing options. Each shell should be a bit larger than the crab’s current shell. Start by opening up a coconut. Put a screwdriver on the indentation of the coconut. Using a hammer, bang the screwdriver into the coconut and pry it open so that you have two halves. Use a spoon to take out the meat, which you can feed to your crabs. Leave it in dechlorinated saltwater for twenty-four hours, and then dry it out in the oven. Place the two halves of the coconut in your tank. For dehydration, you can bake it at 200 Fahrenheit (93 Celsius) for 30 minutes. Pick up some moss from the pet store. Sprinkle it across the substrate. Put a bunch into a plastic shower container to create a little moss pit.  If you prefer, you could also add a little bit of substrate to the bottom of the container. Then, fill it up with some moss for a little play area. Don’t use craft moss or any dyed mosses. You can get some shower containers, such as the kind used to store soap in a shower. If the container doesn’t come with suction cups, you can pick some up from the dollar store. Install the shower container on the side of the tank for a higher hiding place.

Summary:
Add a broken ceramic pot. Place some sanitized shells on the substrate. Make coconut caves. Lay down a moss pit. Install a shower container with suction cups.