What makes hermit crabs so popular as pets is the range of behaviours they display ranging from playful fights, inquisitive exploring, climbing, chirping, burrowing, scavenging. With roaming behaviour typical of hermit crabs, they require sizeable wide gallon tanks to move around in. They withdraw into their shells if frightened or uncomfortable.
Hermit crabs can easily escape from tanks, so always cover your tank with an air holed, perforated lid cover to aerate your tank. Many hermit crabs establish bonds with their owners, so they walk over their owners clothing while their owners stroke and caress them.