Check every shell for an occupant, prepare it with a verified method, let it cool, and offer it to the crabs. Never boil an occupied shell.
Where can I buy good shells, and how do I prepare them?
Natural shells are sold online and in craft stores; several keepers buy from Etsy sellers that list exact opening measurements. Choose by species suitability and measured opening size rather than a marketplace name alone. Before offering new shells, clean and prepare them using a verified method: boiling heat-safe empty shells in dechlorinated water for about five minutes is one such method — boiling is preparation, not proof of complete sterilization. Soak and carefully check each shell first to make sure no crab is hiding inside, and never boil an occupied shell; soaking alone doesn’t prove a shell is empty, so inspect it. Emergency rinsing (a quick rinse with conditioned freshwater when you need shells immediately) is separate from routine preparation.
Sources: HCA Basic Care Sheet (https://hermitcrabassociation.com/phpBB/viewtopic.php?f=51&t=92457); CSJ tank-cleaning guide (https://crabstreetjournal.org/blog/how-do-i-clean-my-hermit-crab-tank-crabitat/) — accessed 2026-10-04
Checks before offering a shell
- Look inside each shell for a hiding crab before it is soaked or heated. Soaking does not prove a shell is empty.
- Let a prepared shell cool completely before offering it.
- Do not use soap, scented cleaners, or other household chemicals on shells that will go into the tank.
- A quick rinse with conditioned freshwater is an emergency shortcut, separate from routine preparation.
Editorial source review: October 4, 2026. This is an editorial draft of keeper guidance, not veterinary approval. Guidance generally focuses on Purple Pinchers (Coenobita clypeatus).
