Hermit Crabs have a pretty varied diet, meaning that they’re omnivorous. They’ll eat vegetable matter like lettuce and spinach, or meat like tiny bits of hamburger or processed dog food. Since this stuff goes bad pretty quickly and should be removed as soon as possible, I recommend serving these items only as an infrequent treat. Most petshops sell commercially prepared Hermit Crab food that your pet(s) will enjoy and that is better for them. A shallow bowl of fresh water should always be kept within easy reach. Even though these are land crabs, they will sometimes soak in the water or drag themselves and/or food through it. This makes housekeeping, as far as the removal and replacement of food that’s going bad or dirty water, a necessity.
Container
The container you choose for your Hermit Crab(s) depends on your budget, available space, and your decorating needs. A couple of small Hermit Crabs will do well in a typical 5-gallon fish tank, while larger crabs will only be comfortable in containers of 10-gallon size or more. You may have noticed that I have referred to the Hermit Crab’s containers in sizes respective of being fish tanks. This is only because I have found that the fish tanks that can be easily found and purchased at your local petshop very often make the very best containers, especially since you can usually buy a cover that’s made specifically for particular-sized aquariums. This helps to make everything a lot easier. Once you get the container home, make sure to wash the container thoroughly with a weak vinegar/water solution. Do not use any harsh detergents as this may prove harmful to the creature(s) you will later introduce into this container.
Landscaping
Hermit Crabs do best in an enclosure that allows them to take advantage of the vertical space as well as the horizontal. It’s a good idea when deciding on a container, where it'll go in your home, and how you're going to decorate it for your pet(s) that you consider this as well. I suggest a few well-placed artificial plants, rocks, and/or pieces of driftwood to give your crabs something to scramble over. Colorful or natural-looking gravel or aggregate will serve as an attractive and easily maintainable substrate (ground layer). All of these things are available in petshops that sell tropical fish. If you want an even more natural setting with live plants, soil, etc., and you don’t mind the extra work involved, you can try your hand at a vivarium set-up.