Enclosure

Housing & setup

Getting the enclosure right before you bring a gecko home makes everything easier. Temperatures, substrate, hides — these aren't optional extras, they're the baseline for a healthy animal.

Never use a heat rock. Heat rocks create localised hot spots that cause severe thermal burns — a gecko will sit on a comfortable-feeling surface without realising the contact area is burning them. Use only under-tank heaters on a thermostat.

Temperature gradient

Warm side (surface)
88–92°F

Belly heat from under-tank heater. Measure with a probe thermometer on the substrate surface — not the air. This is where digestion happens.

Cool side (ambient)
75–80°F

Room temperature often provides this, but check with a thermometer and keep the room above about 68–70°F at night. Your gecko must be able to move between warm and cool — a gradient is mandatory, not optional.

Humidity target: about 40–60% ambient, with a much wetter humid hide. Fat-tails need more humidity than leopard geckos. Permanently above 70% invites mould, scale rot, and respiratory infections; consistently dry air causes stuck sheds and dehydration. Keep the humid hide damp at all times and give the dry side plenty of airflow.

The three hides

Warm hide

Placed on or near the warm side. Your gecko will use this for digestion and resting at higher temperature. Must be fully opaque — darkness is part of the security.

Cool hide

Cool end of the enclosure. Used for temperature regulation and sleeping. Same rules apply — fully enclosed, opaque, and snug enough that the gecko feels secure inside it.

Humid hide

Damp sphagnum moss or coconut fibre inside an enclosed hide. Placed on the warm-to-middle zone. Essential at all times, and used even more in the week or two before a shed. Check moisture daily and never let it dry out.

Substrate options

Ceramic tile

Easy to clean, retains belly heat well, and carries zero impaction risk. Cut to fit over the heat source. Because fat-tails need a humid microclimate, pair tile with a well-stocked humid hide rather than relying on the floor to hold moisture.

Safe
Slate tile (over the warm hide)

Conducts heat evenly and gives rough texture to rub against during a shed. Sterilise before use and make sure edges are smooth.

Safe
Paper towel

The best choice for hatchlings, sick geckos, and quarantine setups. Cheap, easy to replace, and lets you monitor droppings closely.

Safe
Vinyl / lino flooring

Inexpensive, easy to wipe down, and soft underfoot. Zero impaction risk. Cut to fit and replace when it starts to lift or stain.

Safe
Bioactive mix (coco coir + sand + topsoil)

A well-built bioactive substrate can hold a little natural moisture in one part of the enclosure, which suits fat-tails better than it suits many drier-kept geckos. Keep a clear dry side, add a springtail and isopod clean-up crew, and avoid it for hatchlings and juveniles under about six months.

Safe
Coco coir / eco earth (humid side only)

Holds moisture well and is soft to dig in. Use as a layer on the humid side or inside the humid hide, and keep the rest of the floor drier. Fine, dusty coir is a potential impaction risk when a gecko strikes at feeders, so feed on a bare surface or in a dish.

Safe
Reptile carpet

Fibres can catch on claws and toes and cause injuries, and it harbours bacteria if not cleaned frequently. Acceptable short term but not ideal for a species prone to retained shed on the toes.

Caution
Calci-sand / calcium sand

Marketed as digestible, but it clumps in the gut when swallowed during hunting. A serious impaction risk despite the calcium content.

Avoid
Play sand / loose sand

Impaction risk when ingested. Fat-tails come from savanna and rocky scrub, not open dune, so loose sand offers no benefit.

Avoid
Walnut shell

Sharp edges can injure the digestive tract and it does not digest. One of the more dangerous substrates for a small gecko.

Avoid
Wood shavings / bark chips (pine, cedar)

Can mould when damp, present an impaction risk, and aromatic pine and cedar oils are harmful to reptiles. Fat-tail setups are damp in places, which makes shavings a worse choice than usual.

Avoid

Setup checklist

Enclosure — minimum 20-gallon long (30" × 12"), 40-gallon breeder (36" × 18") preferredEssential
For a single adult. Floor space matters more than height. Front-opening enclosures are easier to use and less stressful than reaching down from above.
Under-tank heater (UTH) or heat mat covering roughly a third of the floorEssential
Provides belly heat for digestion. Must be connected to a thermostat — never run unregulated.
Thermostat set for a warm-hide surface of about 88–92°F (31–33°C)Essential
Use a reptile thermostat. A dimmer switch is not a thermostat. Place the probe on the floor surface under the warm hide.
Digital thermometer with probeEssential
Use at least one probe on the warm-side surface. Cheap stick-on dials are inaccurate.
Digital hygrometerEssential
Fat-tails need a hygrometer more than leopard geckos do. Aim for roughly 40–60% ambient humidity, with the humid hide much higher.
Three hides minimum: warm, cool and humidEssential
Without all three the gecko cannot thermoregulate or shed properly. A fat-tail will use the humid hide far more than most keepers expect.
Humid hide with damp sphagnum moss or coco coirEssential
Never let it dry out. Check it daily and re-dampen as needed. Keep it on the warm-to-middle zone.
Shallow water dishEssential
No deeper than the gecko's belly. Change the water whenever it is soiled.
Safe substrate (tile, vinyl, paper towel, or a bioactive mix)Essential
See the substrate list. Avoid loose particle substrates, especially for juveniles.
Cool side at about 75–80°F (24–27°C)Essential
The cool hide should reach this range. Verify with a thermometer rather than guessing.
Ventilation that lets moisture escapeRecommended
A humid enclosure with stagnant air invites mould and respiratory problems. Balance the humid hide with airflow on the dry side.
Low-output UVB lamp (about 5–7%, 10–12 hours/day)Recommended
Not strictly required, but increasingly recommended for crepuscular geckos. If used, mount it so the gecko can move out of the beam and adjust D3 dusting.
Background and cover on three sidesRecommended
A gecko that can see out on every side feels exposed. Cover reduces stress and encourages normal behaviour.
Rough surfaces (slate, cork bark, textured rock)Recommended
Rubbing against rough surfaces helps a fat-tail get out of its skin during a shed.
Small dish of plain calciumRecommended
Let the gecko decide how much to take. Replace it if it becomes damp.
Bioactive clean-up crew (isopods and springtails)Optional
Only if using a bioactive substrate. They keep waste in check on the humid side and help prevent mould.
Live plants for the humid sideOptional
Moderate-humidity plants such as peperomia or spider plant add cover. Keep pots covered so the gecko cannot dig in the potting mix.
Cork bark hides and tubesOptional
Natural-looking alternatives to plastic hides. The rough texture also helps with sheds.
Never cohouse African fat-tailed geckos. Fat-tails do best alone. Two geckos in one enclosure causes chronic stress, competition for resources, and frequently results in injury. Even two females who appear to tolerate each other are under stress that shortens their lives.