Does a hermit crab smell bad when molting?

Yes, hermit crabs can emit an unpleasant odor when they are molting. This odor is caused by the release of chemicals and fluids from the crab's body as it sheds its exoskeleton. The smell can be particularly strong if the crab is in a confined space, such as a tank or terrarium. While the odor is not harmful, it can be unpleasant for humans.