Hermit Crab shells Large natural 5 pack (20-30mm opening)

Ensure your hermit crab has the perfect upgrade. Each shell in our 20–30mm range has been individually chosen for quality, inspected for a smooth interior, and guaranteed free from holes. Our convenient multi-packs offer both value and variety, giving your medium to large crabs several comfortable options so they can select the shell that best suits their needs.

Choosing the Right Shell Size:

• Measure the opening of your hermit crab’s current shell at its widest point.
• For the next size up, add 3–6mm (around 1/8″–1/4″) to that measurement.
• Offer several sizes, as crabs will pick what suits them best—too tight causes stress, too loose leaves crabs unprotected.

Shell Prep Tips (Before They Go in the Tank):

• Rinse new shells in fresh water.
• Boil them for 5–10 minutes to remove debris and possible contaminants.
• Let shells cool completely before offering them to your hermit crabs.

Helpful Hints:

• The ideal shell should let your crab fully retract inside, but not feel loose.
• Providing multiple shell shapes encourages natural selection and reduces aggression.
• Regularly check for wear—replace shells that become chipped or rough inside.

Our shells are natural (never painted) and carefully selected, ensuring only the highest quality shells are available for your pets.

Looking for larger sizes? Check out our full Hermit Crab Shells collection »