Hermit Crab Habitat Setup and Basic Needs
Hermit crab habitats can look very different from one setup to another, but there are 8 essential elements every crabitat needs to keep your hermit crab pets healthy and happy.
Once you have the basics in place, it’s so much fun to watch your crabs explore, climb, dig, and enjoy their environment.
Whether you’re brand new to hermit crab pets or looking to improve and expand your current setup, you’ll find plenty of helpful ideas here.
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By Fred (and Chris) | Updated 04/19/26
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Crabitat Basic Setup Diagram
Hermit Crab Habitat Minimum Size for a Healthy Setup
This is a ten gallon aquarium with mesh top, which can make a good first enclosure for 2-3 very small hermit crabs. But they will outgrow the 10 gallon habitat quickly, so we strongly recommend starting with at least a 15 gallon aquarium with mesh top.
Minimum Size is a 10 Gallon Tank
The absolute minimum size for a hermit crab habitat is a 10-gallon tank. However, this is very small and should only be used temporarily for one or two small hermit crabs. They will outgrow it quickly!
As your hermit crabs grow, they’ll need more space to explore, dig, and thrive. For this reason, it’s a good idea to start with at least a 15-gallon tank, which is typically around 24″ wide x 12″ deep x 12″ tall.
A simple rule of thumb: the larger the crabitat, the healthier and happier your hermit crabs will be.
If you’re looking to save money, check Facebook Marketplace or local yard sales. It’s very common to find larger aquariums at a great price that can easily be turned into an amazing hermit crab habitat.
8 Essential Crabitat Elements:
- 2 water dishes (fresh/salt)
- food dish
- extra shells
- substrate (4-8” deep)
- hiding spots (hideaways)
- climbing elements
- thermometer, humidity gauge
Every healthy hermit crab habitat includes a few key elements that help your crabs feel safe, active, and able to behave naturally.
Before we dive into each one in more detail, here’s a quick overview of what every crabitat should include:
- Two water dishes (one fresh, one saltwater)
- Food dish
- Extra shells (always available for shell changes)
- Substrate (4–8 inches deep for digging and molting)
- Hiding spots (safe places to rest and de-stress)
- Climbing elements (branches, ladders, décor)
- Thermometer and humidity gauge (to monitor conditions)
Each of these plays an important role in keeping your hermit crabs healthy and comfortable. In the sections below, we’ll walk through each one so you can set up your crabitat with confidence.
Water Bowls, Lagoons, and Pools
Land hermit crabs need access to water at all times. It’s essential for their health — they use it for drinking, bathing, and maintaining proper moisture levels.
Even though they enjoy soaking, hermit crabs are not aquatic. They don’t swim or breathe underwater, so their water sources should always be safe and easy to enter and exit.
Here are the most important things to know about providing water for your hermit crab pets:
- Provide two water bowls at all times. Your hermit crabs need both fresh water and saltwater available in their habitat.
- All water must be dechlorinated. Tap water should always be treated to remove chlorine and other harmful chemicals before adding it to your crabitat. We use Amquel Plus.
- Fresh water should always be available. Hermit crabs rely on it for drinking and staying properly hydrated.
- Saltwater supports overall health. While some species (like purple pinchers) can survive without it, all hermit crabs benefit from having access to both fresh and saltwater. We use Hermit Headquarters Soaking Salt for Hermit Crabs (super easy to mix, lasts a long time).
- Water bowls should be deep enough for soaking. Hermit crabs like to climb in and fully submerge, but always include an easy way in and out (like rocks or ramps) to keep them safe. The best water bowls have
It’s important to set up your habitat with smart water dish choices: dishes, bowls, pools, lagoons. They need to be deep enough for your hermies to submerge (at least 3/4 of their shell), and should have easy in and out access (built-in ramp, stairs or other easy access).
Here’s our recent post on Water Dish Ideas.
Hermit Crab Food!
Hermit crabs are nocturnal, and most prefer to eat at night. It’s a good idea to feed hermit crabs at night, around your dinner time.
Most foods can be left for 24 hours, but some foods may need to be removed in the morning (ie raw seafood, strawberries).
Provide at least one food dish (or use a flat shell!). Food can be a target for unwanted pests (ie ants), so it’s a good idea to place the food dish securely above the substrate level if possible.
We feed our hermit crabs clean people food most days, but we always keep a small flat seashell filled with high quality hermit crab food – we are currently using Gargeer Hermit Crab Complete Diet.
Extra Shells Are Crucial
Hermit crabs need extra shells in their crabitats at all times. Part of a hermit crab’s life cycle is burrowing, molting and growing a new (larger) exoskeleton.
When this happens, they need a larger shell to change into. As well, hermit crabs are stimulated by having extra shells to change into just because…! Sometimes they simply get bored and want to try on other shells to see how they fit!
They may be in a perfect fitting shell with the perfect weight and shape, but they try on others as well. Then, chances are they will change back into the perfect one. Extra shells are very important in a healthy crabitat.
Sand Substrate and Options
Hermit crabs need to dig and burrow as part of their life cycles. They do this for molting, to cool off or keep warm, to hide and also to de-stress.
Every crabitat needs to have an absolute minimum of 4 inches of substrate, if you are starting out with tiny hermit crabs and if space in the enclosure is very limited.
Most habitats with medium or larger hermit crabs will need substrate that is 6-8″ deep and as needed by your largest hermit crabs.
Every habitat is different: different dimensions, different number of hermit crabs, different amount of empty surface to start digging into! So watch your hermit crabs as they grow, and make sure they have deep enough substrate to comfortably stay away from other hermit crabs when molting.
Remember… other hermit crabs want to eat their exoskeleton when they shed during their molt, so it’s important for hermit crabs to burrow deep enough so others can’t detect exactly where they are! Here’s more information on hermit crab molting.
The best substrate for most crabitats is a mixture of sand and coco-fiber. This most closely matches the substrate they live in, in the wild. Generally speaking, a mix of 3 parts sand and 1 part coco-fiber is good. The habitat substrate shown below is a mix of sand and coco-fiber: we used Fluker’s Hermit Beach Sand which is already a mix both, and we added extra sand to the habitat in each corner of the habitat.
This also depends on how large (and heavy) the water bowls are (hermit crabs WILL tunnel underneath, and there is a risk of tunnel collapse as well as the normal humidity and moisture level is. In our crabitats, we use one part playsand (from Home Depot) plus one part coco-fiber (Zoo Med).
We also put an acrylic riser under the largest water bowl to avoid tunnel collapse. When you have larger hermit crabs (3″ and above), it’s important to have deep substrate.
Hideaways, climbing branches, fun!
Every crabitat should have spaces where they can hide and rest (especially during the day). Dark corners, coconut huts, hanging coco-hideaways make great spots for hermit crabs to hide in.
Climbing branches are also very important. In the wild, hermit crabs climb! They spend lots of time in trees and bushes, and they love exploring. Driftwood, ladders, bridges, climbing branches are all great elements to add to crabitats.
This also depends on how large (and heavy) the water bowls are (hermit crabs WILL tunnel underneath, and there is a risk of tunnel collapse) as well as the normal humidity and moisture level is.
In our crabitats, we usually use Hermit Beach Sand Substrate by Fluker’s because it’s an excellent mix of sand, coconut fiber, sea salt, calcium carbonate and natural probiotics – our hermit crabs LOVE this stuff!
When you have larger hermit crabs (3″ and above), it’s important to have deep substrate.
Temperature and Humidity Gauges!
In the wild, hermit crabs live in warmer climates. They are healthiest with a crabitat temperature range between 75 – 82 degrees F. When temperatures dip below or above, hermit crabs will burrow.
Prolonged temperatures too cold or hot, the health of the hermit crabs will be jeopardized.
Humidity is even more important to hermit crab health than tempterature. In their natural habitat, it’s humid. And that humidity helps them breathe. In a crabitat, they need a healthy amount of humidity, within a range of 60-80 percent.
Remember, even in their natural habitat of an ocean-adjacent shoreline, temperatures do fluctuate from winter to summer. It’s normal if the temperature and humidity does not stay exact, every day all the time. A little fluctuation is fine. But it’s important to monitor levels, and easiest with a gauge. when there’s too much humidity, mildew and mold can grow. B018VQ71JC
–>More on adding heat and humidity (and when NOT to!)
—> Got Purple Pinchers? More on Heat and Humidity for them here!
TIP: most thermometer and humidity gauges come with adhesive to stick to glass, they won’t hold for long. We use double-sided Gorilla Tape Squares.
Haven't started yet? Here's 6 things to consider:
When planning to set up a crabitat, these six steps will help to incorporate the basic needs of your hermit crab pets. It will ALSO help if/when you want to upgrade the crabitat and expand in the future.
If you start with 2-3 small hermit crabs, it’s perfectly fine to start with a small crabitat. But as they grow, and/or as you want to add more hermit crabs, you’ll want to expand to a larger crabitat.
The type of enclosure, shape (tall vs. wide) and other considerations will lead you to a smarter, healthier crabitat setup.
The six elements to consider when planning a successful crabitat:
- Type of enclosure (see: Crabitat Types of Enclosures)
- Size and orientation (tall or wide)
- Health
- Attractiveness
- Fun and Stimulation
- Behaviors
