The most common leopard gecko emergency I see referenced in exotic vet forums isn’t a disease or genetic issue — it’s impaction, an intestinal blockage caused by incorrect substrate, usually loose sand. This is entirely preventable, and it’s one of several widely-repeated mistakes that send new gecko owners to expensive emergency vet visits within their first six months.
Leopard geckos are marketed as beginner-friendly reptiles, and in many ways they are — but “beginner-friendly” doesn’t mean “low-effort.” They live 10–20 years in captivity, require specific temperature control, and need exotic vet care when things go wrong. The internet still repeats outdated advice (sand substrates, minimal heating, no UVB) that veterinarians have since debunked. This guide reflects current Association of Reptilian and Amphibian Veterinarians recommendations and explains why the standard pet-store setup often isn’t enough.
What you’ll need
Enclosure:
- 40-gallon breeder tank (36” L × 18” W × 18” H) — not the commonly-cited 20-gallon minimum
- Screen lid with secure clips
Heating & temperature control:
- Undertank heater (UTH) sized for 1/3 of tank floor
- Thermostat with probe (non-negotiable — controls heater to prevent burns)
- Two thermometers (one warm side, one cool side)
Lighting:
- Low-output UVB bulb (2.0–5.0 UVB)
- Timer for 12-hour day/night cycle
Substrate:
- Ceramic tile, paper towel, or aspen shavings — never loose sand
Hides & décor:
- Three hides minimum: warm-side hide, cool-side hide, humid hide (small container with moist sphagnum moss)
- Water dish (shallow, changed daily)
- Optional: flat rocks, cork bark (nothing with sharp edges)
Feeding supplies:
- Appropriately-sized live insects (crickets, dubia roaches, mealworms)
- Calcium powder (with D3 if no UVB; without D3 if using UVB)
- Feeding tongs
Total cost: $200–400 for the complete setup. Budget an additional $150–300 for an initial exotic vet check-up.
Gecko tank requirements: enclosure size & layout
Most beginner guides cite a 20-gallon long tank as the minimum. This comes from older ASPCA guidelines and remains widespread online. It’s technically survivable, but veterinarians and experienced keepers now recommend starting with a 40-gallon breeder tank (36” × 18” footprint).
Why the upgrade? Leopard geckos are ground-dwelling lizards. They don’t climb — they patrol horizontal space. A 40-gallon breeder offers twice the floor area of a 20-long, which allows you to create a proper thermal gradient (more on that below) and gives the gecko room for naturalistic behavior. Keepers who’ve upgraded from 20- to 40-gallon tanks consistently report improved feeding response, reduced stress behaviors, and more visible activity. I’ve kept geckos in both sizes; the difference in their comfort is visible.
If you’re starting with a juvenile gecko, a 20-gallon tank is acceptable for the first 6–12 months, but plan the upgrade in advance — you’ll need it.
Tank placement:
- Quiet area away from foot traffic
- Room temperature 70–75°F (the tank will create its own gradient)
- Avoid direct sunlight (causes overheating)
Heating & temperature: the thermostat is non-negotiable
Leopard geckos are cold-blooded. They can’t generate body heat — they regulate it by moving between warm and cool zones. Your job is to create those zones.
Temperature gradient:
- Warm side (floor surface temp): 88–92°F
- Cool side (floor surface temp): 75–80°F
- Nighttime drop: 5–10°F cooler is normal and beneficial
An undertank heater (UTH) placed under one-third of the tank floor creates the warm zone. This mimics their natural behavior of resting on sun-warmed rocks. The gecko absorbs heat through its belly, which is essential for digestion.
Here’s the critical part: the UTH must be controlled by a thermostat. Without one, the heater can reach 110–120°F, causing thermal burns on the gecko’s belly — a painful injury that requires vet treatment and often leaves permanent scarring. The thermostat’s probe sits on the floor of the tank above the heater, and the thermostat cuts power when the surface reaches your set temp (I set mine to 90°F).
This is a $40–80 combined investment for heater + thermostat. It’s not optional.
Use two thermometers — one on the warm side, one on the cool side — to verify your gradient. Stick-on analog thermometers are unreliable; use digital probe thermometers or an infrared temp gun.
Lighting: the UVB debate
For years, the conventional wisdom was that leopard geckos don’t need UVB lighting because they’re crepuscular (active at dawn/dusk) and get vitamin D3 from their diet. That’s changing.
Current research and exotic vet recommendations from institutions like UC Davis Veterinary Medicine increasingly support low-output UVB (2.0–5.0 UVB) for leopard geckos. UVB helps them synthesize vitamin D3 naturally, which improves calcium metabolism and may reduce the risk of metabolic bone disease — especially in juveniles and breeding females.
You’ll still see “UVB optional” in older guides. I recommend providing it. Use a low-output UVB tube (not a desert-strength 10.0 bulb, which is too intense) and replace it every 6–12 months (UVB output degrades even when the bulb still produces visible light). Run it on a timer for a 12-hour day/night cycle.
If you choose not to use UVB, use a calcium supplement with D3. If you do use UVB, use calcium without D3 to avoid oversupplementation (vitamin A toxicity is a documented vet concern).
Substrate: what NOT to use
Loose sand is still sold in pet stores as “natural desert substrate” for leopard geckos. Do not use it.
Leopard geckos hunt by lunging at prey. When housed on loose substrate, they ingest particles with every meal. Over time, this causes impaction — a blockage in the intestines that prevents digestion. Signs include lethargy, dragging hind legs, swollen abdomen, and refusal to eat. It’s life-threatening and requires emergency exotic vet intervention. I’ve read enough forum threads from owners whose geckos died from impaction to know this isn’t a minor risk.
Safe substrates:
- Ceramic tile (holds heat well, easy to clean, looks natural)
- Paper towel or unprinted newsprint (cheap, disposable, good for quarantine)
- Aspen shavings (debated, but safer than sand if particles are large)
Never use:
- Loose sand (including “calci-sand” marketed as digestible)
- Fine gravel
- Walnut shells
- Adhesive reptile carpet (claws get caught; harbors bacteria)
Tile is my preference. Cut it to fit the tank floor, leaving space for the humid hide. It’s easy to spot-clean and mimics the flat rock surfaces geckos naturally bask on.
Leopard gecko setup: hides & humidity
Leopard geckos need three hides — not one, three — to feel secure and regulate temperature.
- Warm-side hide: Placed over the undertank heater. Gecko retreats here to digest and absorb heat.
- Cool-side hide: Placed on the opposite end. Gecko uses this to cool down.
- Humid hide: A small container (like a plastic sandwich box) with an entrance hole cut in the lid, filled with moist sphagnum moss. This provides the localized humidity geckos need for shedding.
This is important: leopard geckos are arid-climate reptiles. The internet sometimes conflates “reptile care” into one generic set of advice, but humidity needs vary wildly by species. Leopard geckos need 30–40% ambient humidity — not the 50–70% range you’d use for a tropical species. High humidity promotes respiratory infections and scale rot, both of which are common issues in improperly-kept geckos.
The humid hide solves the shedding problem without raising overall tank humidity. Keep the sphagnum moss damp (not soaking) and replace it weekly.
Feeding & nutrition
What to feed: Live insects — crickets, dubia roaches, mealworms, occasional waxworms (high-fat treat). No wild-caught insects (pesticide risk).
How much & how often:
- Hatchlings/juveniles (0–12 months): Appropriately-sized insects daily. “Appropriately-sized” means no larger than the space between the gecko’s eyes.
- Adults (12+ months): 2–4 insects per feeding, 2–4 times per week.
Overfeeding captive geckos leads to obesity and metabolic bone disease. Adults don’t need daily meals.
Gut-loading & dusting: Gut-load insects 24 hours before feeding (feed the insects nutritious food — leafy greens, commercial gut-load diet — so the gecko benefits). Dust insects with calcium powder 3–4 times per week. Use calcium with D3 if you’re not providing UVB; calcium without D3 if you are.
Water: Provide a shallow water dish. Change it daily. Geckos drink by lapping, and they also absorb some moisture through their skin while resting in the humid hide.
Handling & temperament
Leopard geckos tolerate handling better than many reptiles, but they’re not affectionate. They don’t seek out human contact. Excessive handling stresses them.
Best practices:
- Wait 1–2 weeks after bringing a gecko home before handling (acclimation period)
- Handle 5–10 minutes at a time, 2–3 times per week
- Support the entire body; never grab the tail (they’ll drop it as a defense mechanism, and while it grows back, the regrown tail looks stumpy and doesn’t store fat as well)
- Wash hands before and after (salmonella risk, though rare with captive-bred geckos)
If your gecko gapes (opens mouth wide), rattles its tail, or runs away, put it back. Those are stress signals.
When to see a vet
Leopard geckos need exotic vet care — not all general-practice vets treat reptiles. Locate an exotic vet before you need one.
Schedule an initial check-up within two weeks of acquisition, especially if you bought from a pet store (higher parasite and disease risk than a reputable breeder).
Seek emergency exotic vet care if you see:
- Refusal to eat for more than 5 days
- Swollen abdomen or dragging hind legs (impaction)
- Wheezing, mucus around nostrils or mouth (respiratory infection)
- Retained shed on toes or around eyes (can cause necrosis)
- Visible injury or bleeding
- Lethargy combined with weight loss
Annual wellness exams are standard for adult geckos. Budget $150–300 per visit.
What beginners underestimate
I’ve kept reptiles since childhood, and I still underestimated the heating setup on my first gecko. I thought “heat mat” meant I could plug it in and forget it. I checked the surface temp with an infrared gun three days later and found it was 118°F — hot enough to burn. I’d gotten lucky that the gecko had avoided that corner. The thermostat arrived the next day, and I haven’t skipped one since.
The second thing: the lifespan commitment. Leopard geckos live 10–20 years in captivity. That’s longer than most dogs. Vet care, tank maintenance, and feeding costs add up. This isn’t a short-term pet.
The third: the upgrade pressure. Experienced keepers consistently report that geckos moved from 20-gallon to 40-gallon tanks show better feeding response, more activity, and reduced stress behaviors. As gecko keepers describe it: “I thought my gecko was just a lazy morph. Moved him to a 40-breeder and he started patrolling at night like a different animal.” That tracks with what ReptiFiles’ leopard gecko care guide recommends — and with what I’ve observed in my own animals.
FAQ
Can leopard geckos live together?
No. Adult males are strictly territorial and will fight, causing serious injury. Females may tolerate proximity, but veterinarians discourage cohabitation — it causes chronic stress, suppresses immune function, and shortens lifespan. House leopard geckos individually.
How often do leopard geckos shed?
Juveniles shed every 1–2 weeks; adults shed every 4–8 weeks. You’ll see the skin turn pale and opaque a day before shedding. Provide a humid hide so they can shed cleanly. Retained shed, especially on toes or eyes, requires vet attention.
Do leopard geckos need a heat lamp?
No. They need under-belly heat (undertank heater), which mimics their natural behavior of resting on warm rocks. A heat lamp can work if you use a ceramic heat emitter on a thermostat, but undertank heating is simpler and more effective for this species.
Leopard geckos are long-lived, low-drama reptiles if you get the setup right from the start. The mistakes that send new owners to the vet — loose sand, unregulated heat, high humidity, cohabitation — are all preventable with current information. The initial investment is real ($200–400 for setup, plus vet costs), but once the infrastructure is in place, daily care is straightforward: feed 2–4 times a week, change water daily, spot-clean waste, monitor temps.
For substrate comparisons and heating equipment reviews, see best reptile heating options. If you’re curious why leopard geckos have eyelids when most lizards don’t, why leopard geckos have eyelids explores the evolutionary angle.