Tag Archive for habitat

Setting up a proper crabitat

Let’s look at how to set up a proper hermit crab habitat, which we refer to as a crabitat.

Basing your tank set up on what you saw at the petstore or mall cart where you may have purchased your hermit crabs is a recipe for disaster. Kritter Keepers and wire cages are death boxes and should never be used.

Listed below are the primary components of a proper set up and we will discuss them in detail. If you are not willing to equip the tank properly you should return your hermit crabs or rehome them, they will not thrive without a properly set up habitat. Captive hermit crabs can live over 30 years in the proper habitat. Most hermit crabs die either in the first month of ownership, during the first molt of ownership or within the first year to 18 months.  So yes, they can technically ‘survive’ in poor conditions but why on earth would you purposely do this to an animal???

A simple list of the items you will need to properly outfit the crabitat. There are low cost options for most of these items.

  • Tank
  • Lid
  • Light*
  • Heat
  • Substrate
  • Gauges
  • Bowls
  • Climbers
  • Hiders
  • Plants and Vines

The tank itself should be glass or lexan and large enough to comfortably house your hermit crabs. A MINIMUM of 2 gallons of space per small or medium hermit crab but 5 gallons per crab is much more humane. Large and jumbo crabs will need much more space, 10 gallon minimum. A 10 gallon tank is too small for even one large or jumbo crab. Plan for the future when purchasing your tank, allow for the growth of your crabs or additions to the herd.   A used tank is perfectly fine and will greatly reduce the cost of supplies.

The tank must have a lid that retains humidity. A screen lid with glass, lexan or plastic wrap on top is what is typically used. Hermit crabs require humidity to breathe. Opening the lid for feedings and water changes each day usually provides enough air exchange. Fresh air flow reduces mold, mildew and fungus growth.

Light is required, whether they are used as your heat source or not. Hermit crabs require a normal 12 hour cycle of light and dark, it is vital to the molt process. If your crabitat is in a well light room that will meet the need of daytime light. Do NOT place your tank in directly sunlight!

UVB is believed to extend the life span of captive hermit crabs. UVB bulbs must be mounted in such a way that there is no glass or plastic barrier between the bulb and the hermit crabs. Most people mount the lid inside the tank.  Bulbs must be replaced every 12 months.

For nighttime viewing, LED in red or blue is safe. Your hermit crabs do not require a light at night.

Hermit crabs require warm temperatures. This can come from overhead lights or from heat pad (often called under the tank heater or UTH) which is placed on the wall of the tank and not under it. Over head lights or heat emitters are not recommended for inexperienced pet owners. They make it challenging to maintain the correct environment in the tank.

Ways to heat your crabitat

Global Temperature and Precipitation Maps by Month

Gauges are the only way to monitor and maintain proper heat and humidity levels. The tank temperatures should be a range of 75F to 82F.  72F is the absolute minimum and your tank should not remain at this temperature long term. A temporary dip or spike in temperature is not cause for concern. A range means that your tank should have areas of different temperatures. Some species seem to enjoy slightly warmer temperatures but the common clypeatus is happy in the 75-82F range. Check the substrate temperature as well to make sure it is not too hot. Overly warm substrate will kill molters or discourage molting. Humidity ranges should be 70-80% this is relative humidity. Occasional higher humidity is not cause for concern but maintaining excessively high humidity could lead to flooding or lethal bacteria due to over saturation of your substrate. Your analog hygrometer will need to be calibrated before use. Wireless, digital gauges are relatively cheap and are more accurate than analog gauges.

Substrate should be a mix of 5 parts play sand and 1 part eco earth. The ideal mix will keep the sand moist throughout. The consistency should be so that you could easily make a sand castle. That means that molting burrows will not collapse from drying out. We suggest using a brackish water to expand the eco earth bricks. This will help reduce the chance of mold. The eco earth should be DRY when mixed into the sand so you don’t end up with water logged substrate at the beginning. You can always add water once the crabitat environment is stable, if needed. In many cases it is not needed. Starting with too wet substrate will lead to flooding and/or bacterial blooms. Mix your substrate dry, close up the tank with the lid and all the decor and allow it to stabilize for 48 hours. If the humidity is too low you can mist the substrate. Then wait another 24 hours and check the humidity again. It is much easier to add moisture to the substrate than it is to dry it out once it is in the tank.

The eco earth will help maintain humidity but you may need to add some moss pits if your levels are too low. Not all moss is safe so be sure to check our list: Which types of moss are safe for my hermit crabs?

Substrates for hermit crabs

Three bowls will be needed. Two of the bowls should be deep enough to allow your hermit crabs to submerge themselves. One should be fresh water and one should be ocean water made with marine grade salt mix. All water that comes in contact with your hermit crabs must be treated to remove chlorine, chloramines, ammonia as well as other chemicals. The third bowl will be for food. These don’t have to be reptile dishes specifically but they should be something that your smallest crabs can easily enter and exit. Many people use disposable Gladware type bowls for water pools. We recommend placing a rock, fake plant or coral in the pool for the smaller crabs to climb out.

Places to hide, things to climb on, as well as plants and vines are important to create an environment that is stimulating and enriching for your hermit crabs. Huts do not have to be made of coconut shells, many things will work. The same holds true for things to climb on. There are lots of DIY ideas or less expensive ideas for creating vertical climbing opportunities. Fake plants and vines from a craft store will work as well as the ones you find at the pet store. Some live plants are safe for the crabitat but your hermit crabs will most likely kill them.

Creating additional levels in your crabitat to maximize usable space

Your goal should be to create an environment that is as close to what hermit crabs experience in nature as possible. Hermit crabs live primarily on beaches, so think tropical!

Here are some examples of properly set up crabitats:

This slideshow requires JavaScript.

Ask Milo – What size tank do I need?

Mattiesse ask:

I am the proud owner of 4 beautiful crabs in Brisbane. the problem is, is that I live in NSW so my other parents in queens land need to take care of them. luckily im bringing them down here but I cant bring the tank, so im gonna have to make a new home. im planning on getting more hermit crabs as well so I need to know how to make the best sized and equipt tank for soon to have not 4 but 6-8 hermit crabs. how big should the tank be and what is the best stuff to get for them so they live a long healthy life!!!

How exciting! The amount of space you need depends on the size of crabs and the number of crabs. Long term you should have 10 gallons of space per crab so you would need at least an 80 gallon tank if you are going to keep 8 hermit crabs. That will give them plenty of space in your crabitat as they grow. You will need a lid that can hold in the humidity, a proper heat source, a day time light and about 12 inches deep substrate (mix of play sand with a bit of cocofiber mixed in). Also food dishes, saltwater and fresh water ponds (deep enough to submerge in), gauges, places to hide and things to climb. Oh and yes a bunch of shells!

For more details check out some of our articles:
Hermit Crab Essentials Shopping List
Newbies Guide to Hermit Crabs

Ask Milo – Vertical tanks

Finn asks:

I don’t have a lot of horizontal space in my house–is it okay to have a small-based but extremely tall tank for hermit crabs, basically with the necessary deep sand, but with multiple ‘tiers’ for them to climb and bathe and hang around?

Yes so long as your substrate is sufficiently deep and with a smaller footprint you may want to make the substrate even deeper than recommended so you don’t have a problem with molters crowding each other. The base should allow for both water dishes as well. Making multiple tiers is a great idea. You can also use fish netting and other climbables to make every vertical surface climbable. Stop by the forums for suggestions from our members.

Your friend in a pinch,

A home for your Hermit Crab

Originally written by Vanessa Pike-Russell-Updated by Stacy Griffith

NOTE: The tank or habitat of land hermit crabs is often referred to as a Crabarium, Crabitat or Crabitank. This is a pet name for a hermit crab’s home.

A proper hermit crab habitat

A proper hermit crab habitat

The best housing is a glass tank with securely fitting lid.
A glass tank with lid helps keep the needed humidity and temperature levels stable. You should allow a small gap between the tank sides and the lid if condensation begins to appear on the sides of your tank.Disadvantages:Glass tanks, unless second hand, are somewhat expensive but worth the extra expense. If you have a lid that doesn’t allow for a gap for air circulation you can get a build up of condensation on the walls, which can cause bacteria build-up within the tank and create unsavory conditions for your hermit crabs to live in.
A proper hermit crab habitat

A proper hermit crab habitat


A ten gallon (10G) glass tank with lid is the minimum recommended size and will house up 2 small hermit crabs. If you have hermit crabs larger than a grapefruit then you will definitely need to upgrade to a larger tank. Larger crabs need more area to dig and moult, and to de-stress.

A proper hermit crab habitat

A proper hermit crab habitat

Different shapes and sizes

There are different shapes and sizes of glass tanks. The most popular type are called ‘breeder’ tanks and they are more cube-shaped than the standard ‘tall’ fish tank and have more floor space.

A proper hermit crab habitat

A proper hermit crab habitat- custom made

Custom Made Tanks

If you want a crabarium that will be more hermie-friendly, why not save some cash and get a custom tank built. Land Hermit Crab tanks do not need to have a bottom made as thick as with fish tanks do since they are not filled with water. If you phone around the different pet stores and aquariums, there are some custom tank builders that you can get a quote from to build to your specifications.

A proper hermit crab habitat

A proper hermit crab habitat

A popular size of custom made tank is a 2ft by 2ft by 1.5ft tank. It looks much like a ‘cube’ in shape, and has a base of 4 square feet. You will find that it is much easier to fit everything inside the tank that is essential, and that hermit crabs will not need to do the ‘spider walk’ along the edges of the glass because there is more room. Most fish tanks are very long and tall because fish are able to make use of the vertical height.
A proper hermit crab habitat

A proper hermit crab habitat

If you cannot get a custom made tank, try making use of the extra vertical space by installing levels or fixing climbing items such as sanitised mangrove root trees, sanitised driftwood, coral trees, ZooMed’s Jungle Gym, or even more creative, a network of choya (or other sanitised wood logs) that hermit crabs can climb and hang upside down and move along the network.
NOT a proper hermit crab habitat

NOT a proper hermit crab habitat. Kritter Keepers are death boxes.

Glass is better than plastic

Despite what your pet store or crab cart will tell you, land hermit crabs do not fare well in the plastic tanks with vented lids. If you do have a plastic tank with vented lid, the first thing you will need to do is cover some of the vents. You can use saran wrap (cling wrap) or sticky tape for this purpose.

Photo Credit: Stacy Griffith, Michelle Stephens