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

Hermit Crab Diet Overview

Hermit crabs are omnivorous scavengers. In the wild, they eat virtually anything they find on the forest floor — fallen fruit, decaying wood, leaf litter, dead fish, and even animal droppings. In captivity, replicating this variety is the key to keeping hermit crabs healthy and active.

A good hermit crab diet includes fresh fruits, vegetables, protein sources, calcium, and natural fiber. Variety matters more than any single food item.

Safe Foods for Hermit Crabs

Fruits

Vegetables

Protein Sources

• Dried shrimp — a hermit crab staple
• Dried mealworms — high protein
• Freeze-dried bloodworms — excellent treat
• Boiled egg — small pieces, including crushed shell
• Unseasoned cooked chicken — occasional protein boost
• Dried fish — unseasoned, small pieces
• Spirulina — nutrient-dense algae powder

Calcium Sources (Essential)

Calcium is critical for exoskeleton health, especially before and after molting:

• Cuttlebone — leave a piece in the tank at all times
• Crushed oyster shell — sprinkle on food
• Crushed eggshell — baked, then ground to powder
• Coral sand — crabs will pick at calcium-rich sand
• Calcium powder supplement — dust lightly on food

Leaf Litter and Natural Fiber

Hermit crabs eat decaying organic matter in the wild. Add these to the tank for grazing:

• Oak leaves — dried, pesticide-free
• Magnolia leaves — long-lasting, crabs eat them slowly
• Indian almond leaves — antifungal properties
• Coconut husk fiber — crabs nibble on substrate
• Cork bark — crabs chew on it for fiber

DIY Hermit Crab Food Mix

A simple homemade dry mix provides balanced nutrition:

1. Dried coconut flakes (unsweetened)
2. Dried shrimp or mealworms
3. Crushed cuttlebone
4. Dried seaweed or spirulina
5. Dried fruit pieces (mango, papaya, apple)
6. Ground flaxseed

Mix in equal parts and store in an airtight container. Offer a small spoonful alongside fresh food each night.

Commercial Food: What to Watch For

Many commercial hermit crab foods contain harmful preservatives. Avoid products with:

• Ethoxyquin — a pesticide used as a preservative, toxic to hermit crabs
• Copper sulfate — harmful to invertebrates
• Artificial colors and flavors
• Table salt — only marine-grade salt is safe

Look for brands that list natural, recognizable ingredients. Several specialty hermit crab shops online sell preservative-free food blends.

Foods to NEVER Feed Hermit Crabs

These foods are toxic or harmful:

• Table salt — use only marine-grade aquarium salt
• Citrus fruits — oranges, lemons, limes, grapefruit (too acidic)
• Onion and garlic — toxic to hermit crabs
• Chives and leeks — all allium family plants are harmful
• Processed foods — chips, crackers, bread with preservatives
• Dairy products — hermit crabs cannot digest dairy
• Pesticide-treated produce — always wash thoroughly or buy organic

Freshwater and Saltwater Pools

Water is just as important as food. Every hermit crab enclosure needs two pools:

• Freshwater pool — dechlorinated tap water or spring water, deep enough for crabs to submerge
• Saltwater pool — mix marine-grade salt (like Instant Ocean) with dechlorinated water to the correct specific gravity

Both pools should be deep enough for the largest crab to fully submerge but have an easy way to climb out (a ramp or rough surface). Crabs drink from both pools and use them to regulate hydration and fill their shells with water.

Never use table salt to make saltwater. Table salt contains iodine and anti-caking agents that are toxic to hermit crabs.

Feeding Tips

• Feed in the evening — hermit crabs are nocturnal and forage at night
• Use a shallow dish — keeps food off the substrate and reduces mold
• Remove uneaten food each morning
• Rotate foods daily — variety prevents nutritional deficiencies
• Do not worry about small appetites — hermit crabs eat tiny amounts
• Leave cuttlebone available 24/7 — crabs graze on it as needed