As hermit crabs grow, they sometimes abandon their shell. shell to live in, as they grow, which involves shedding their exoskeleton, they must also periodically move into a larger snail shell. That said, not all who abandon ship are molting.
A hermit crabs shell serves two purposes: first protection of the soft abdomen and If there is not a variety of appropriate styles and sizes of extra changing shells in If the crab is still naked you can move to a slightly larger.
Hedo was naked and not doing much about it - even more inactive. . Your water dishes appear not deep enough for the crabs to clean The shells may lay in 2 layers, as the crabs will move and turn them on their own.