Ashy Gecko Caresheet and Bioactive Habitat Maintenance
Ashy geckos (Sphaerodactylus elegans) are diurnal, semi-arboreal lizards native to Cuba and Hispaniola, although they’re also found in Florida as an invasive species. These itty bitty geckos make low-difficulty pets due to their minimal space demands and hardiness.
Of course, just because they’re tiny and resilient doesn’t mean that their husbandry doesn’t need to be taken seriously. Here’s how to care for ashy geckos with a bioactive terrarium.
Materials needed for housing an ashy gecko:
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18”L x 18”W x 18”H front-opening enclosure, or larger (escape-proofed)
Housing Requirements
Ashy geckos are considered “micro-geckos,” which means that they are among the smallest lizards in the world! Given that adults are only ~3” long, it’s easy to fall into the trap of thinking that their diminutive size means ashy geckos can be housed in an equally teeny-tiny enclosure. However, ashy geckos should still have access to a temperature gradient and UVB lighting. In addition, you will need enough space for live plants to sustain your bioactive soil, which means you’ll need space on top for a proper LED grow light, too. More space relative to the gecko’s size also allows for providing a more varied landscape within the enclosure, enhancing your pet’s quality of life by facilitating freedom of choice.
At very least, a single ashy gecko should be housed in no smaller than a front-opening 18”L x 18”W x 18”H (25 gallon) enclosure, with larger being ideal. This allows enough space for proper thermo- and photo-regulation, semi-arboreal accommodation, and room to fit all of the necessary heating and lighting equipment that must go on top.
Recommended enclosures:
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HabiStat Glass Terrarium, 18”x18”x18”
Can ashy geckos cohabitate?
Ashy geckos are known to generally get along well together, but sometimes they don’t. Here are the ground rules:
- Do not keep males together (they’ll fight)
- Do not keep males and females together (they’ll make babies)
Groups of similarly-sized females in a generously-sized enclosure are the most likely to get along, but it’s not guaranteed. Ultimately, cohabbing ashy geckos is done at your own risk. Be prepared to separate the geckos if you notice signs of violent conflict. The good news is that ashy geckos don’t need to be cohabbed, and do fine when housed singly.
Up to 4-5 ashy geckos should be able to be housed together in an 18x18x18 enclosure with enough space to get away from each other as necessary. Providing more space and a generously-sized basking area reduces the likelihood of conflict.
Substrate Requirements
Ashy geckos prefer a tropical habitat with moisture-retentive (but not wet) soil and lush plant life. They don’t dig/burrow, but providing a few inches of substrate at the bottom of the enclosure helps with stable humidity and is also necessary for comfortably hosting the roots of your bioactive setup’s plants. Plan on a substrate layer at least 3” deep.
The Bio Dude’s 18x18x18/24 Terra Fauna Bioactive Kit works well for setting up a bioactive ashy gecko enclosure, especially if it’s your first time with bioactive. This kit includes everything you need for peace of mind in setting up a new bioactive enclosure: plant-ready tropical soil mix, sphagnum moss, leaf litter, drainage material, mesh, and The Bio Dude’s BioShot soil inoculant.
If you prefer to mix your own substrate, however, see our preferred soil recipes here.
You can’t have a bioactive enclosure without a good microfauna clean-up crew (CUC). For a tropical terrarium, a combination of tropical springtails, powder isopods, and earthworms are likely to do well in this environment. Ashy geckos like to snack on the springtails and isopods that they encounter, so expect to reseed your CUC population occasionally. Using a subterranean-dwelling isopod species like dwarf white isopods also helps when dealing with micro geckos.
Plan on setting the enclosure up at least 1 month in advance so your plants and CUC can get established without the strain of having to deal with a gecko roommate or few. This is a great time to quarantine your new gecko in a temporary enclosure, which will give you a chance to watch for illness, test for (and treat) parasites, and generally make sure you’re not introducing any pathogens into your new ecosystem. A quarantine enclosure should be set up much the same as the long-term enclosure, but with easily cleaned-décor and a temporary substrate like coconut fiber. The enclosure itself can be a cheap fish tank or even a modified plastic tub.
Décor (Environmental Enrichment) Requirements
As semi-arboreal reptiles, ashy geckos spend time both on and above the ground. They like to bask, climb branches and walls, hide behind and under leaves, hang out inside tubes, hunt bugs, and generally explore!
Cork flats, paper bark, and extra leaf litter provide variety in places to hide under on the ground.
Cork tubes make excellent branches that also double as functional hides.
Manzanita twigs make perfectly slender climbing branches and perches for tiny geckos.
Seed pods make attractive, biodegradable accents for visual interest and a CUC snack.
Wall-mounted hides facilitate freedom of choice in places to hide by providing a hidey-hole option that isn’t on the ground, similar to a hole in a tree.
Textured backgrounds provide a sense of security by helping the gecko feel hidden from predators, create an enriching climbing surface, and add to the setup’s natural aesthetic. (Even if you don’t go with the fancy textured background, make sure to cover the sides and back of the enclosure with an opaque material to help your gecko feel more secure in its home!)
Live, tropical plants are essential to a functional tropical bioactive enclosure. Their roots help keep your soil fresh, balanced, and clean! Here are some good choices for ashy geckos:
- Aglaonema
- Alocasia
- Anthurium
- Bird’s nest fern
- Croton
- Fittonia
- Philodendron
- Pilea
- Pothos
- Tradescantia/Wandering Dude
Use the largest plants that will fit in your enclosure, as these are more likely to transplant well, and be more beneficial to your substrate. In a small enclosure like an 18x18x18, this may mean you can only fit one plant, and that’s okay. Make sure to quarantine them before adding them to your enclosure, and keep in mind that you will need to routinely prune the plant to help it fit comfortably within the enclosure.
Lighting/Temperature/Humidity Requirements
Lamps should be on for 12 hours/day. Alternatively, you can use a smart timer to sync your lamps with your local sunrise and sunset times for more natural seasonal variation.
Visible Light
Since ashy geckos are diurnal (active during the day), they benefit from having extra visible light in their enclosure to help better simulate the brightness of sunlight. In addition, a heat lamp plus UVB provides nowhere near enough light to nourish the live plants your bioactive setup needs to stay functional and healthy!
Your bioactive ashy gecko enclosure should have at least one LED bar grow lamp, long enough to span at least ~75% of the enclosure’s length.
UVB
Ashy geckos may be able to survive without UVB as long as they get enough D3 in their calcium supplement, but it’s a risk that you’re better off not taking. Instead, provide a basking area with a UVI (UV Index) of 2.0-3.0 to allow the gecko to make its own vitamin D3, as well as enjoy other health benefits.
Not all UVB lamps are high-quality (or even safe!), however. We recommend the 12” Arcadia T5 SO ShadeDweller 7% UVB kit for ashy geckos.
The strength of your UVB diminishes with distance from the source, and mesh partly blocks the output as well. It’s best to measure the UVI at your basking spot with a Solarmeter 6.5 tool, but if that’s not an option, placing your basking area 6-8” directly below the UVB bulb should do the job.
Heat
Like other reptiles, ashy geckos are cold-blooded, which means they need the right set of temperatures in their environment for their body to function properly. Here’s what your ashy gecko’s temperature gradient should look like:
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Basking: 85-90°F
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Cool side: 75-82°F
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Nighttime: >65°F
Use two digital probe thermometers to keep track of the temperatures in the enclosure. One probe should be on the basking surface under the heat lamp, and the other probe should be in the middle of the cool side (“shade”).
How do you heat an ashy gecko enclosure? All you need will be a low-wattage incandescent heat bulb. Incandescent bulbs produce sun-like infrared, unlike non-light emitting heat sources like heat projectors, ceramic heaters, and heat mats. This makes them the best and most natural way to help your cold-blooded friend regulate its metabolism!
Recommended heat bulbs:
*A different wattage may be required to achieve the right basking temperature for your gecko. Basking temperature varies based on basking distance, room temperature, and even the enclosure itself. Be prepared to experiment a little bit to create the correct environment for your pet.
A thermostat isn’t required for micromanaging your basking temperature, but it’s a good safeguard against potential overheating. Plug your heat lamp(s) into the thermostat, and place the thermostat’s probe on the cool end of the enclosure. The thermostat should be set to turn off the heat lamp at 82°F.
Humidity
As a tropical species and a thin-skinned gecko, ashy geckos need higher humidity levels of 60-70% on average to stay hydrated and in good health. To monitor your enclosure’s humidity levels, use a digital probe hygrometer, with the probe placed on the cool side of the setup.
Increase and maintain the humidity levels in your enclosure by misting regularly with a handheld pressure sprayer. It also helps to occasionally pour water into the substrate (which you will need to do anyway for your plants).
Expect to mist 1-2x/day (evening and/or morning), but if you live in a dry climate, more may be needed. Consider adding a reptile humidifier (fogger) and letting it run for a few hours every evening for a beneficial spike in humidity. Make sure to clean and disinfect your humidifier weekly! Use RO water, distilled water, spring water, or tap water with a quality water conditioner to remove chlorine/chloramines.
The above photos show the difference in coloration of an adult Ashy gecko versus a juvenile.
Dietary Requirements
Ashy geckos are insectivorous, which means that they are insect-eaters. Here are the best foods to keep your pet healthy:
Feeder Insects
- Crickets
- Dubia roach nymphs
- Discoid roach nymphs
- Black soldier fly larvae
- Bean beetles
- Rice flour beetles and larvae
- Buffalo beetles and larvae
- Mealworms
- Superworms (small)
- Fruit flies
- Wax moths
- Springtails
- Isopods
Small geckos eat small bugs, so feeder insects should be no larger than the gecko’s head.
Feeding schedule
Young ashy geckos that haven’t transitioned to adult coloration can be fed every day. Adults should be fed every other day instead. Offer as many feeders as the gecko will eat in ~5 minutes and adjust based on body condition as needed.
Don’t just pick one type of bug to feed to your gecko. Just like you, your pet needs a variety of foods in its diet to thrive! Rotate at least 3 different types of bugs, preferably more.
Supplements
All feeder insects should be dusted with a reptile calcium powder at every feeding. Every 2-3 feedings, add multivitamin with vitamins A and D3 as well. We recommend Arcadia CalciumPro Calcium with Magnesium and Repashy SuperVite for ashy geckos.
To “dust” feeders with supplement powder, place the feeders in a sandwich bag or small container, add the supplement, and shake gently under the feeders are evenly coated.
Supplements degrade over time, so we recommend replacing your supplements every 6 months to keep them fresh.
Gut-loading
All feeder insects must be fed quality food in order to provide optimal nutrition to your pet. This process is called “gut-loading.” Rather than giving your feeders kitchen scraps or random fruits and vegetables, use a plant-based insect chow specifically formulated for gutloading, such as The Bio Dude’s Bug Grub.
Gut-load feeders for 2-3 days before offering them to your gecko for best results.
Maintaining Your Bioactive Ashy Gecko Terrarium
Bioactive enclosures are often touted as low-maintenance, but there are still some things you need to do to keep your mini-ecosystem functional and thriving:
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Water the plants. Tropical plants need plenty of water, but too much water is just as bad as too little. Keep the soil moist, but not wet.
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Remove urates. Although an established bioactive environment will be able to handle your gecko’s poo with no problems, urates are more difficult to break down and may need to be manually removed. Expect to occasionally scrub waste off of branches and other décor as well.
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Prune the plants. As your plants grow, some of them might start to overrun the enclosure. Trim them regularly with clean scissors or shears to keep an attractive shape and prevent an overgrown appearance.
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Top up the CUC. Your ashy gecko is likely to snack on its CUC from time to time. Keep an eye on the CUC population and add more isopods or springtails as needed.
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Add more biodegradables. Your CUC will break down your leaf litter and bark accents into soil over time, so you will need to add more every once in a while.
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Add The Bio Dude’s BioVive. Throughout the life of your bioactive terrarium, some elements become depleted. Mix this into your substrate every 6-12 months as needed.
Written by Mariah Healey of Reptifiles, 7/10/2026
- Josh Halter
