Mourning Gecko Enclosure: Tank Size and Setup

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A mourning gecko enclosure has to do two jobs at once. It must hold humidity and offer climbing surface. This species spends almost its whole life off the ground.

It also has to scale up smoothly. An all female colony grows fast through parthenogenesis, and numbers can climb without warning.

Getting the size, layout, and climate right from day one avoids a stressful rebuild later. This guide covers tank size by group, the vertical planted layout these geckos actually use, substrate, temperature, humidity, lighting, egg sites, colony control, and escape proofing.

For daily feeding and misting routines once the enclosure is built, see the mourning gecko care routine.

For the species overview, start with the mourning gecko profile.

Mourning Gecko Enclosure Size by Group

Mourning geckos, Lepidodactylus lugubris, are small. A 2020 study in Scientific Reports measured adults at about 51 mm snout to vent (2 inches) and 67 mm total length (2.6 inches), with a maximum of 8 to 10 cm (3 to 4 inches). Captive adults usually stay around 7 to 8 cm.

That small body size changes the math. Height and climbing area matter more than floor space in a mourning gecko enclosure.

No zoo or veterinary source publishes a minimum tank size for this species, so the figures below are the common keeper standard for a 3 inch arboreal gecko. A single gecko or a pair can start around 8 to 10 gallons, built taller than it is wide. A trio to a group of five does better in a tank around 12 by 12 by 18 inches.

Mourning geckos reproduce asexually, and a colony can double within a year. Most keepers size up early instead of upgrading every few months.

Watch for signs an enclosure has become too small. Constant hiding, food competition at a single dish, and eggs stacking up faster than they can be managed all point to a colony that has outgrown its space.

Choose a front opening design over a top opening lid. Top openings let heat and humidity escape every time the enclosure gets serviced.

A tall arboreal terrarium built for climbing species gives the colony the vertical footprint it needs. It does this without wasting floor space the geckos rarely use.

For help comparing glass, PVC, and screen options, see the lizard enclosure buying guide.

Vertical Layout and Furnishings

Mourning geckos are almost fully arboreal. In the wild they live under bark, in leaf axils, and among dense foliage rather than on open ground.

The tank should read as a wall of climbing surface. It should not read as a floor with a few sticks propped against it.

Cork bark rounds and flats should run from the substrate up toward the ceiling. That gives the geckos vertical routes and hiding spots at once. Add several horizontal and diagonal branches at different heights so animals of different sizes can each claim a perch.

Live or artificial plants with broad leaves, such as pothos, snake plant, or bromeliads, add cover and hold humidity. Bromeliad cups also work as drinking and egg laying sites. Keep the top third dense with foliage, since that is where these geckos spend most of their active hours.

Leave open gaps between furnishings too. Dense cover matters, but geckos also need clear lines of sight to move between perches without squeezing past every leaf.

Substrate and Bioactive Setup

A mix of coconut fiber, sphagnum moss, and organic topsoil holds humidity well and supports live plants. A layer 2 to 3 inches deep is enough for a display enclosure that skips a full bioactive system.

For a bioactive build, layer the materials in order. Start with expanded clay or lava rock for drainage, add a mesh barrier, then the soil mix, then leaf litter on top. A premixed tropical bioactive substrate saves the work of blending drainage media and soil separately, and it comes free of pesticides.

A cleanup crew of springtails and tropical isopods breaks down waste and leftover food before mold sets in. Seed the substrate with a springtail culture at least two weeks before adding geckos. That gives the population time to establish.

For a full walkthrough of drainage layers, substrate depth, and plant choices, see the bioactive enclosure guide.

Mourning Gecko Temperature

Mourning gecko temperature needs are modest next to basking lizards. Laboratory work reported in Scientific Reports puts the species’ preferred body temperature at 29.2 degrees Celsius (84.6 degrees Fahrenheit), with field body temperatures running 3 to 4 degrees Celsius cooler, or about 77 to 79 degrees Fahrenheit. Ambient air of 75 to 85 degrees Fahrenheit during the day covers both figures.

Let it drop to 68 to 75 degrees at night, which matches the 5 degree Celsius (9 degree Fahrenheit) night drop the Merck Veterinary Manual recommends for reptiles. A warm side in the high 70s to low 80s, paired with a cooler side in the mid 70s, gives the geckos a gradient to use. These geckos do not need an intense basking spot.

A small warm perch, just a few degrees above ambient, is enough. Produce it with a low wattage heat source on a thermostat.

Avoid daytime highs above 88 degrees Fahrenheit. That is already 3 degrees past the measured preference, and sustained heat that high stresses a species built for shaded, humid microhabitats. The same study found juveniles ate significantly more at 26 degrees Celsius than at 20, so a cool room slows growth in young geckos.

Run any heat source through a reptile thermostat rather than a plain timer. Small enclosures heat up fast. A thermostat is the most reliable way to guard against a spike above safe limits.

Humidity and Misting Schedule

Target 60 to 80 percent humidity, the common keeper standard for this tropical Pacific species. Merck gives 20 to 95 percent as the span across reptile species and stresses that a humid microclimate matters even more than the room average. Expect a brief spike close to 90 percent right after misting, then a drop as the enclosure dries between sessions.

Mist once or twice daily, in the morning and again in the evening. Use plain water or reverse osmosis water in areas with hard tap water.

Good airflow on at least one side keeps constant dampness from turning into mold or bacterial growth. A screen top or side panel, paired with a dense planted interior, usually strikes the right balance.

Track actual conditions instead of guessing. A digital hygrometer and thermometer combo gives an accurate reading. A manual or automatic mister keeps swings between sessions from getting too wide.

See the measurement gear guide for choosing accurate probes and gauges built for small, humid enclosures.

Lighting and Low UVB Option

Mourning geckos are most active at dusk and dawn, with some daytime movement in an established colony. They are not sun basking lizards. This species does not need the strong UVB output a bearded dragon or uromastyx setup requires.

A very low output UVB bulb, built for crepuscular and shade dwelling geckos, is a reasonable middle ground. It supports natural vitamin D3 synthesis without forcing the geckos into open, brightly lit basking they rarely show. Ambient room light or a low intensity plant light works as a substitute for keepers who skip UVB entirely.

If UVB is used, mount it so the strongest zone sits in the upper third of the enclosure. That is where these geckos actually perch. Screen or mesh lids block 25 to 45 percent of UVB, so factor that loss into placement.

Run lighting on a steady 12 hour photoperiod. Or shift it seasonally between 10 and 14 hours to mimic natural daylight.

For choosing between fluorescent and mercury vapor options, see the UVB lighting guide.

The heating and UVB basics page covers the underlying science in more depth.

Egg Sites and Colony Growth Control

Mourning geckos reproduce through parthenogenesis. Nearly every individual is female, and a female can lay fertile eggs without a male present. Clutches hold exactly two eggs, laid every 14 to 63 days through most of the year according to the Scientific Reports study.

That biology is the single biggest planning factor for any tank meant to house more than one animal. Provide multiple egg laying sites so dominant females are not competing over one spot. Good options include bromeliad axils, curled cork bark, and gaps behind background panels.

Eggs are adhesive and often get glued to bark or glass. Plan on some eggs hatching inside the display enclosure itself. Incubation is slow and temperature driven: a Marquette University embryology study cites 65 days at 25.5 degrees Celsius and 103 days at 22 degrees Celsius, and its own eggs held at 26 degrees took up to 77 days.

Hatchlings emerge at 15 to 22 mm snout to vent length, small enough to slip through a screen tear. A colony at room temperature therefore produces hatchlings on a rolling three month delay from each clutch, which is why numbers seem to climb suddenly.

• Check egg sites weekly, and remove eggs to a separate incubation container if population growth needs to slow down.
• Watch adult density. Dominant females consume more food and produce more clutches, and crowding raises stress.
• Split a colony into two enclosures once it passes 8 to 10 adults. Also split when hatchlings appear faster than they can be rehomed.
• Separate hatchlings from adults for the first several weeks to reduce competition for food and track survival.

Escape Proofing the Tank

Adult mourning geckos squeeze through surprisingly narrow gaps. Hatchlings are smaller still. A gap wide enough for a fingernail is wide enough for a hatchling to escape.

Front opening doors with tight seals hold up better than lids that get lifted and set back down loosely. Look for magnetic or sliding closures built to stay flush.

Check screen panels for tears every few weeks. Geckos exploit a gap fast in a warm, humid enclosure.

Seal any wire or tubing access points with foam or mesh. Confirm that door tracks close flush on both the top and bottom edge. A five minute check during each misting session catches most problems before an escape happens.

Mourning Gecko Setup Checklist

Keep checking the setup even after it is finished. A mourning gecko enclosure changes as plants grow in and the colony expands. The general gecko housing guide covers how these same principles apply across other small arboreal species.

Frequently Asked Questions

How big should a mourning gecko enclosure be for a colony?

A colony of 4 to 6 adults does well in an 18 by 18 by 24 inch enclosure. Groups past 8 to 10 adults usually need splitting into two tanks. Parthenogenesis lets numbers climb fast, so most keepers plan for the colony they expect in a year rather than the one they are starting with.

Do mourning geckos need UVB lighting?

A very low output UVB bulb built for shade dwelling species is optional but supports natural vitamin D3 production. Many keepers skip UVB and rely on dietary supplements, dusting feeder insects with calcium and vitamin D3 powder instead.

Can mourning geckos live without a male?

Yes. Nearly all mourning geckos are female and reproduce through parthenogenesis, laying fertile two egg clutches without mating. Males exist but are rare and typically infertile, so an all female colony is normal and expected.

What humidity does a mourning gecko enclosure need?

Keep humidity between 60 and 80 percent, with a short rise toward 90 percent right after misting. Place the hygrometer at gecko height, not on the floor, for the most useful reading in a vertical enclosure.

How many mourning geckos can live together?

Small groups of 2 to 6 share space well in a properly sized vertical enclosure with hides and perches. Watch for dominant females monopolizing food or egg sites. Split the group if aggression or crowding shows up.

What substrate is safest for a mourning gecko enclosure?

A coconut fiber and organic soil blend, free of added fertilizer or pesticide, holds humidity well. It carries none of the impaction risk that loose sand or gravel does. A bioactive layer with springtails and isopods keeps that substrate healthy long term.