What Do Hermit Crabs Eat? Complete Diet Guide [2026]

What Do Hermit Crabs Eat?

Hermit crabs are omnivorous scavengers that eat a wide variety of foods in the wild. In captivity, providing a diverse and balanced diet is key to keeping your hermit crabs healthy and active. A proper diet supports molting, shell growth, and overall vitality.

Safe Foods for Hermit Crabs

Fruits

Hermit crabs enjoy many types of fruit. Offer small pieces of these safe options:

• Mango, papaya, and coconut (favorites for most crabs)
• Banana, apple, and pear
• Grapes, blueberries, and strawberries
• Watermelon and cantaloupe
• Dried fruit (unsweetened, no sulfites)

Vegetables

Vegetables provide important vitamins and fiber. Safe choices include:

• Spinach, kale, and romaine lettuce
• Carrots (raw or cooked)
• Sweet potato and squash
• Broccoli and zucchini
• Corn and peas
• Seaweed and spirulina

Protein Sources

Protein is especially important before and after molting:

• Dried shrimp, krill, and bloodworms
• Cooked egg (scrambled or hard-boiled, no seasoning)
• Cooked chicken or fish (plain, unseasoned)
• Freeze-dried mealworms or crickets
• Sardines (packed in water, no salt added)

Calcium Sources

Calcium is critical for exoskeleton health. Always keep one or more of these available:

• Cuttlebone (the most popular option)
• Crushed oyster shells
• Crushed eggshells (baked to sterilize)
• Coral sand or coral chips
• Calcium powder supplements (reptile-grade)

Foods to Avoid

Some foods are toxic or harmful to hermit crabs. Never feed these:

Feeding Schedule and Tips

Follow these guidelines for a healthy feeding routine:

• Frequency: Offer fresh food daily, ideally in the evening when crabs are most active
• Portion size: A small bottle cap amount per 2-3 crabs is usually sufficient
• Variety: Rotate foods daily to provide nutritional balance
• Cleanup: Remove uneaten fresh food after 24 hours to prevent mold and bacteria
• Food dishes: Use shallow, non-metallic dishes to serve food

Commercial vs. Homemade Food

Many pet store hermit crab foods contain harmful additives. If you use commercial food, check the ingredients and avoid anything containing copper sulfate, ethoxyquin, or BHT. Consider making your own food mixes using dried coconut, dried shrimp, seaweed flakes, and crushed cuttlebone for a healthier alternative.

Water Requirements

Water is just as important as food for hermit crabs. Every tank needs two water pools:

Freshwater

• Treated with a water dechlorinator (removes chlorine and chloramine)
• Deep enough for the largest crab to submerge, with a way to climb out
• Changed every 2-3 days or when dirty

Saltwater

• Made with marine salt mix (never table salt or aquarium salt)
• Follow the package directions for proper salinity
• Equally important as freshwater — crabs need both to regulate their gill moisture and mineral balance
• Changed every 2-3 days or when dirty

Both water pools should use natural sea sponges or pebbles to help smaller crabs climb in and out safely without drowning.

Signs of a Poor Diet

Watch for these symptoms that may indicate nutritional deficiencies:

• Lethargy or reduced activity
• Frequent failed molts or difficulty molting
• Faded or dull exoskeleton color
• Loss of limbs (can indicate stress from poor nutrition)
• Refusing to eat for extended periods

A varied, fresh diet combined with constant access to calcium and both types of water will keep your hermit crabs thriving for years.