Thinking Beyond Bearded Dragons? Here's What a Leopard Gecko Setup Actually Needs

Updated September 21, 2026. The temperatures, humidity ranges and schedules in this article were checked that day against the RSPCA, the Merck Veterinary Manual and a veterinarian-written PetMD care sheet, linked at the bottom.

Plenty of people arrive at leopard geckos the same way: they have kept, or nearly bought, a bearded dragon, and they assume the gecko is the small, easy version of the same animal. It is not. Eublepharis macularius is active mostly at dusk and dawn, spends daylight hours under cover, and eats on a slower rhythm. A beardie setup scaled down will get the heat wrong, the lighting arguably wrong and the feeding clearly wrong. The mistakes rarely kill a gecko in week one. They show up between week two and week eight as a gecko that will not eat, a shed stuck on the toes, or a belly that has been sitting on something too hot.

A common leopard gecko (Eublepharis macularius). Photo: Matt Reinbold, Wikimedia Commons, CC BY-SA 2.0.

So instead of walking through the tank room by room, this version starts from what a new owner actually sees going wrong in the first sixty days and works backward to the number that caused it.

Symptom first: five things new owners report, and the setting behind each

What you notice	Usual setting behind it	Number to check against
Gecko hides all day and refuses food in the first 1–2 weeks	Warm end too cool, or no secure hide on the warm end	Basking zone 28–30°C (82–86°F), cool end 24–26°C (75–79°F) — RSPCA
Skin left on toes or tail tip after a shed	No humid hide; room air very dry	RSPCA: one hide with damp moss; Merck notes humidity should be substantially higher during shedding
Gecko lies flat on the warm floor for hours, reddened belly	Heat mat without a thermostat	RSPCA: a thermostat must be used with all heat sources
Straining, no droppings for days after eating	Loose substrate swallowed with prey	RSPCA advises against calcium sand, beech chips and loose substrates
Thin tail after two months	Adult schedule used on a juvenile, or unsupplemented insects	Juveniles daily, adults every other day — RSPCA and PetMD agree

Notice that the last column has only one line where two sources give the same answer word for word. That is the feeding rhythm. Almost everything else in leopard gecko care is published as a range, and the ranges do not line up neatly.

The gecko is not a small bearded dragon: a side-by-side

The Merck Veterinary Manual keeps a single husbandry table that lists both species. Reading the two rows together is the fastest way to see what a beardie keeper should unlearn.

Item (Merck table)	Leopard gecko	Bearded dragon
Air temperature gradient	25–30°C (77–86°F)	25–32°C (77–90°F)
Basking spot	about 5°C above the gradient	about 5°C above the gradient
Night	about 5°C lower	about 5°C lower
Humidity	20–30%, higher when shedding	20–30%, higher when shedding
Lighting	no special requirements	broad-spectrum UVB (290–300 nm) essential
Diet	primarily insects, minor carnivorous component	primarily insects with herbivorous and carnivorous components

The temperature rows look similar; the difference is in how the heat is delivered. A beardie wants an intense overhead lamp to bask under. A gecko that spends the day under cover warms through its belly from a warm hide, so RSPCA's basking zone of 28–30°C is modest by beardie standards and the heat source is often a mat or a low-output lamp run through a thermostat.

The UVB question the references answer three different ways

This is the real disagreement, and a new owner will hear all three answers in the same week.

• Merck Veterinary Manual: lists "no special requirements" for leopard gecko lighting, in contrast to the bearded dragon row.
• RSPCA (UK): recommends a 2–5% UVB tube covering one-half to one-third of the enclosure length, giving a UV index gradient from about 0.7 in the basking zone down to zero in shade, on a 12-hours-on, 12-hours-off cycle.
• PetMD care sheet (written by Maria Zayas, DVM, reviewed by Ivan Alfonso, DVM): includes UVB for 10–12 hours a day.

Why the split? Older husbandry was built on the fact that leopard geckos can be kept alive on dietary vitamin D3 alone, because they avoid daylight. Newer welfare guidance asks a different question: not whether the animal survives without UVB, but whether a low, optional dose with plenty of shade is better. Those are both honest positions. The cost asymmetry is what decides it for me. A low-output tube over one end, with hides that give full shade, costs a fixture and a replacement tube each year and carries little risk if the gecko can walk out of it. Leaving it out makes the calcium-with-D3 powder the only safety net, so a missed dusting schedule matters more.

Sixty days of feeding, counted

Here is what the published schedules add up to over the first sixty days. The totals are my arithmetic from the stated frequencies.

Gecko	Feeding days in 60	RSPCA supplement approach	PetMD supplement approach
Juvenile, fed daily	60	every feed dusted with vitamin and calcium supplement; plain calcium bowl always available	calcium with and without D3 on alternating days; multivitamin once or twice a week (about 9–17 multivitamin dustings in 60 days)
Adult, every other day	30	same: every feed dusted, calcium bowl always in	same alternation across 30 feeds; multivitamin roughly 9–17 times if you keep the weekly rhythm regardless of feed days

The two approaches differ in method more than in intent: RSPCA puts powder on every meal and lets the gecko self-select extra calcium from a dish, while PetMD rotates three powders on a schedule. The first is harder to get wrong. The second gives better control of D3, which is why it matters more if you choose to run no UVB at all.

How big is "big enough"? Converting the two size rules

RSPCA gives a minimum vivarium of 60 cm long, 40 cm high and 30 cm deep for one adult. PetMD says 10 gallons minimum for a juvenile and 20 gallons or more for an adult. Gallon labels are awkward because tanks with the same label come in different shapes. A common 20-gallon "long" aquarium is nominally about 30 × 12 × 12 inches (roughly 76 × 30 × 30 cm), which gives about 2,280 cm² of floor against RSPCA's 1,800 cm² (60 × 30), but ten centimetres less height. A 20-gallon "high" is nominally about 24 × 12 × 16 inches, close to the RSPCA box. For a ground-dwelling gecko, floor area is what buys a real warm-to-cool gradient, so if I had to choose between the two shapes I would pick the long one, and treat either as a floor, not a target.

Humidity: three numbers, one practical answer

Merck gives 20–30%, RSPCA about 30–40% at the cool end, and PetMD "under 50%". They are not really in conflict: all three describe a dry enclosure. The shed problems beginners see come from the absence of a single damp microclimate, not from the overall room number. The practical answer is a dry tank inside one of these ranges plus one hide lined with damp moss that the gecko can choose.

What I would set up on day one, and what I would wait on

If a friend asked me to set up a first leopard gecko, I would spend the money on a thermostat and a probe thermometer before anything decorative, because the belly-burn and cold-gecko failures both come from not knowing the floor temperature. I would use a solid substrate such as tile or paper towel for the first sixty days, since RSPCA warns against loose materials and a new owner cannot yet tell normal droppings from a problem. I would add a low UVB tube over one end with full shade at the other, accept the small ongoing cost, and still dust every meal. The humid hide goes in on day one. The things I would wait on are the naturalistic décor and any second animal; a gecko that eats reliably for two months has told you the basics work.

Day-one checklist

• Thermostat connected to every heat source, probe on the warm floor.
• Warm end 28–30°C, cool end 24–26°C, night not below 18°C (RSPCA figures).
• At least one hide on each end, plus one humid hide with damp moss.
• Solid substrate; no calcium sand or chips.
• Feeding calendar: daily for a juvenile, every other day for an adult.
• Supplement plan chosen (dust every feed, or a rotation) and written down.
• Decision made and noted on UVB, so you are not switching methods mid-way.

Coming from beardies? Our weekly bearded dragon routine shows how different the dragon's schedule is, and the crested gecko temperature and humidity guide covers a gecko that wants the opposite humidity.

Tip: A heat mat is only as safe as the device controlling it, so choose the controller before the mat. Reptile thermostats with a floor probe let you set the warm-end limit instead of guessing. (These are Amazon Associate links — we may earn a small commission on qualifying purchases.)

What each figure rests on (checked September 21, 2026)

• RSPCA — How to care for a leopard gecko: enclosure minimum, temperature zones in °C, humidity, UVB tube and UVI, hides, feeding frequency, substrate and thermostat warnings.
• Merck Veterinary Manual — Important husbandry requirements for selected reptiles: temperature gradients, humidity and lighting for both species.
• PetMD — Leopard Gecko Care Sheet (veterinarian-written and reviewed): tank sizes in gallons, UVB hours, humidity ceiling, supplement rotation.

Temperature figures are in Celsius as published by RSPCA (UK) and Merck, with Fahrenheit conversions added; gallon figures are PetMD's US tank sizes. This is general husbandry information, not veterinary advice; a reptile vet who has examined your gecko should set its individual targets.