Blueberry Hermit Crab

C. purpureus prefers a tropical and/or subtropical environment, observed in the wild to thrive in humid temperatures between 27-29°C. While they prefer these temperate conditions, they have been observed in a laboratory setting to withstand temperatures as low as about 8°C and as high as 38°C. They populate beaches with rocky crevices or areas of shrubbery which provide a suitable hiding place during the day, though they have also been observed hiding in and under trash on less pristine beaches. The crabs also seem to prefer beaches with rocky tidepools and supratidal zones to deposit zoea larvae in.

C. purpureus are omnivorous scavengers, consuming washed-up fish, detritus, and various forms of vegetation in its natural habitat. In captivity, they show no real preference as a species and will eat a wide variety of fruits and vegetables, including bananas, pumpkin, broccoli, corn, carrots, peppers, as well as leafy greens. Experts in hermit crab husbandry also recommend a small portion of meat in their diet, which can range from raw or cooked beef, to bloodworms, to cockroaches.

C. purpureus is very popular in the aquarium and pet trade for their vibrant colors and generally friendly nature. Husbandry experts would recommend a minimum enclosure size of 40 liters for one hermit crab, with a mix of sand and coconut fiber as substrate deep enough for the crab to burrow. They also require access to fresh and salt water, both changes regularly. The recommended tank temperature is between 24-28°C with a humidity level between 80-90%. C. purpureus also needs decorations in its artificial habitat for it to hide in and around, as well as multiple extra gastropod shells for it to choose from.