So, you’ve brought home a hermit crab (or maybe a few), and now you’re wondering—what do they actually need to thrive?
Whether you’re a new crab parent or upgrading from a tiny plastic tank, this guide is for you. Let’s break down the real basics of hermit crab care—without the outdated myths.
🌿 Hermit Crabs Are Not Disposable Pets
Despite what you may have heard, hermit crabs aren’t low-maintenance, short-lived pets. In fact, with proper care:
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Hermit crabs can live up to 50 years
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They can grow as big as a softball
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They need space, humidity, and friends
Let’s set your crabs up for a long and happy life!
🏝️ The Basic Setup: What You Actually Need
Here’s what your hermit crab tank should include:
✅ Tank Size
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Minimum: 10-gallon long tank for each crab, jumbo 15 gallon for each
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Bigger is better—hermit crabs are social and need space to dig and explore
✅ Substrate
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Use a 5:1 mix of play sand and eco earth (coco fiber)
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Must be deep enough to dig 3x your biggest crab’s height (for molting)
✅ Temperature & Humidity
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Maintain 75–85°F (use a heat mat on the side of the tank)
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Humidity should stay around 80%
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Use a digital thermometer and hygrometer
✅ Fresh and Saltwater Pools
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Use dechlorinated water, Prime is excellent
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Provide both fresh and marine-grade saltwater in deep dishes, Instant Ocean is great for salt Never use table salt
✅ Hiding Spots & Climbing Decor
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Hermit crabs love to explore, climb, and feel secure
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Add hammocks, driftwood, moss hides, and shells to crawl in
Looking for handmade accessories? Check out my Etsy shop for cozy macramé hammocks and natural tank décor!
🍽️ Feeding Your Crabs
Hermit crabs are omnivores and scavengers. Offer a variety of:
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Fresh fruits & veggies (carrots, apples, spinach)
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Proteins (boiled egg, chicken, fish flakes)
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Whole grains (oats, brown rice)
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Calcium sources (crushed oyster shell, cuttlebone)
Avoid processed food, seasonings, and anything salty or sugary.
Check out my Esty shop for dried foods that can last for up to 3 days, depending on type
Common Myths (That Can Harm Your Crabs)
Let’s clear these up right away:
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❌ Myth: "Crabs are fine in a plastic Kritter Keeper."
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🛑 Truth: These don’t hold heat or humidity—dangerous for molting.
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❌ Myth: "They only live a few months."
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🛑 Truth: That’s usually due to poor setup—crabs can live decades!
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❌ Myth: "They don’t need friends."
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🛑 Truth: Hermit crabs are social and should be kept in groups of 2+.
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🐚 Final Thoughts
Caring for hermit crabs is rewarding, but it takes a bit of know-how. With the right setup and some love, your tiny beachcombers can thrive for years.
At The Crafty Crab Cove, I’m all about creating cozy, enriching spaces for hermit crabs—because they deserve more than plastic and neglect. 💕
