The terrarium should be kept away from drafts and if your house is cold at night you may consider putting a heating pad on low under one half of the terrarium. This is a last resort and should be used only if your house is extremely cold. Hermit crabs can get too hot and if you leave them in direct sunlight or in a car, they will get overheated and die. Hermit crabs can tolerate temperatures as low as fifty degrees but they must have an adequate amount of sand to burrow in. Hermit crabs are slow eaters.
Many pet stores sell ac commercial brand hermit crab diet.
This is good but you should give your hermit crab a little variety. If they don t eat the hermit crab diet and you provide no other sources of nutrition, they will die. A basic vegetarian diet should please and nourish the colony. It should be a mixture of corn meal, oats and chopped fruit, all held together by peanut butter. Peanut butter is a favorite among hermit crabs.