Neon Day Gecko (Phelsuma klemmeri)
Neon day geckos (Phelsuma klemmeri) are a diurnal, omnivorous type of arboreal gecko native to coastal northwest Madagascar. They are also known as yellow-headed day geckos. They prefer tropical forest for habitat, and as a strictly arboreal species, they spend most of their lives up off the ground. According to the IUCN, this species is listed as Endangered.
Neon day geckos generally grow 3.25-3.75″ / 8.3-9.5cm long, and like most day geckos, are popular because of their vibrant colors. This species can be identified by its iridescent yellow head+neck, turquoise blue back+tail, and light brown hip region. Tiny black speckles are present on top of the head and back, with a black stripe on each side, and a pale belly. The body features a sharply tapered snout, round lidless eyes, sticky toe pads, and delicate velvety skin.
Neon day geckos are a relatively hardy species of day gecko. If you pay attention to providing appropriate neon day gecko care in captivity, you may expect a lifespan of up to 15 years.
Neon Day Gecko Shopping List
These are products I personally recommend for setting up a functional neon day gecko terrarium. Some of the links in this care sheet are paid links — if you’d like to know why ReptiFiles uses paid links, visit this page.
- Front-opening 12” x 12” x 18” terrarium, or larger
- 25w Zoo Med Repti Basking Spot
- 5.5″ Fluker’s Repta-Clamp Lamp with Dimmable Switch
- Exo Terra Light Bracket
- 26w Zoo Med Reptisun 5.0 Compact Coil UVB
- 12″ Zoo Med Naturalistic Hood
- Arcadia Jungle Dawn LED Bar, 12″
- Zilla 24/7 Digital Power Center
- Zoo Med Digital Thermometer/Hygrometer Combo, x2
- Exo Terra Mister
- Zoo Med Eco Earth, 5 quarts
- Environmental enrichment
- Magnetic Gecko Ledge, small
- Pangea Biodegradable Gecko Feeding Cups, small
- Crested gecko meal replacement powder
- Miner-All Outdoor calcium powder
Neon Day Gecko Enclosure Size
Neon day geckos need an enclosure that is large enough to give them adequate opportunity to explore, hunt, and generally exercise natural behaviors. They are also arboreal, which means that they need a terrarium that provides a generous amount of climbing space. Considering that neon day geckos can grow up to 4″/10cm long, the minimum recommended enclosure size for a single neon day gecko is 12”L x 12”W x 18”H / 30 x 30 x 45 cm or similar. Where possible, larger is always better!
Here are some enclosures that are appropriate for housing neon day geckos:
- Exo Terra Natural Terrarium Mini/Tall (12x12x18)
- ReptiZoo Full Glass Reptile Terrarium 12″ x 12″ x 18″
- Exo Terra Natural Terrarium Small/Wide (18x18x18)
- Zen Habitats 2’x2’x2′ PVC Panel Reptile Enclosure
- Exo Terra Natural Terrarium Small/Tall (18x18x24)
- ReptiZoo Full Glass Terrarium 18″ x 18″ x 24″
Can multiple neon day geckos be housed in the same enclosure?
Day geckos have been historically housed together successfully in breeding pairs or small breeding groups of one male and multiple females. However, if you don’t intend to breed day geckos, then it’s best practice to keep only one or a group of strictly females.
To house multiple day geckos together, the size of the enclosure needs to be proportionately increased so the geckos can get away from each other as needed.
Lighting & UVB for Neon Day Geckos
Neon day geckos are diurnal, which means that they are primarily active during the day. This means that they need access to a basking area, are exposed to direct UVB during the day, and have relatively poor night vision.
13 hours of light should be provided per day during summer, and 11 hours of light per day should be provided during winter in order to encourage healthy hormonal cycling, with gradual adjustments in-between.
Neon day geckos require UVB lighting as part of their setup in order to survive and produce their best color. UVB lighting can be tricky, because in order to get the right strength of UVB (measured by UV Index, or UVI), distance must be considered.
As a rough estimate, to provide appropriate UVB to a neon day gecko, you will need one of the following lamps, depending on the enclosure’s height:
- 26w Zoo Med Reptisun 5.0 — 2-4″ / 5-10cm
- 18″ Zoo Med T8 Reptisun 5.0 — 2-4″ / 5-10cm
- 18″ Arcadia T8 Forest 6% — 2-4″ / 5-10cm
- Arcadia ShadeDweller Arboreal kit — 4-6″/10-15cm
For best results, coil UVB bulbs should be mounted horizontally in a reflective fixtures such as the Zoo Med Naturalistic Hood or Exo Terra Compact Top. Tube UVB bulbs should be mounted in highly reflective, reptile-specific fixtures (ex: Zoo Med Reptisun T8 Terrarium Hood, Arcadia ProT5), not hardware store fixtures.
UVB bulbs must be replaced every 6-12 months (per manufacturer instructions) in order to remain effective.
(These recommendations are approximations. It is strongly recommended to use a Solarmeter 6.5 to determine the best placement to achieve a UVI of 3.0-4.0 in the basking area at the top of the enclosure.)
For diurnal species, it’s also best practice to provide bright light with a color temperature of around 6500K in addition to UVB and heat lamps. Neon day geckos with access to bright lighting are likely to be more active, have better appetites, and display better color.
Neon Day Gecko Temperature Requirements
Humans are warm-blooded, which means that our body temperature is automatically regulated. Neon day geckos, however, are cold-blooded, and they need to move between areas of different temperatures in order to regulate their body temperature. In the wild, neon day geckos may warm up by basking in a warm patch of sunlight. In captivity, sunlight can be replicated with a white incandescent heat lamp.
- Basking area temperature: 90°F (32°C)
- General temperatures: 80-82°F (27-28°C)
- Nighttime temperature: 68-74°F (20-23°C)
Generally speaking, it doesn’t take much to achieve such a low basking temperature, especially considering that neon day geckos are arboreal and will likely bask quite close to the heat lamp. One 25w incandescent bulb such as the Zoo Med Repti Basking Spot or Exo Terra Daytime Heat Lamp should be plenty, but results will vary based on your room temperature. If you notice that the basking area is too warm, dial down the heat down with a lamp dimmer or switch to a lower wattage bulb. If your basking area is too cool, you will need a higher wattage bulb.
Warning: Day geckos are known to climb upside-down on the mesh on top of their enclosure, which makes them susceptible to burns. To prevent this from happening, use a lamp stand to suspend the lamp over the enclosure, such as the Exo Terra Light Bracket.
The basking area should be a vine or branch directly under the heat lamp. Because your gecko is arboreal and will be living in a tall enclosure, the warmest temperatures will be at the top (near the heat lamp), and the coolest temperatures will be toward the bottom. You will need vines, branches, and foliage at all levels to allow for proper thermoregulation.
To track basking temperature, use a digital probe thermometer, with the probe zip-tied to the basking surface under the heat source. Most reptile-brand digital probe thermometers function well.
Neon Day Gecko Humidity Requirements
Neon day geckos do best in a moderate- to high-humidity environment, with an average humidity of 60-80% as measured by a digital probe hygrometer with the probe placed in the middle of the enclosure. Humidity levels that are consistently too high or low can cause health problems for your gecko. However, it is natural for humidity to be lower in the warm area and higher in the cool area. It is also normal and healthy for humidity levels to rise at night and fall during the day.
To raise the humidity in your gecko’s enclosure (and provide an extra source of drinking water), use a pump-style pressure sprayer such as the Exo Terra Mister to wet down the enclosure every morning and evening.
Neon Day Gecko Substrate Options
Because neon day geckos are arboreal (tree-dwelling), they don’t spend much time on the ground. Although it’s not necessary to use bedding for them, it’s very useful for helping to stabilize humidity. It also acts as a cushion if they fall from their perch, which may happen while they are hunting.
It’s best to use a moisture-retentive substrate that is similar to the soil in a neon day gecko’s natural habitat. Here are some reliable options:
- DIY tropical mix: 60% organic topsoil, 40% coconut fiber
- Zoo Med Reptisoil
- Zoo Med Eco Earth
- Exo Terra Plantation Soil
- The Bio Dude Terra Fauna bioactive kit
Only 2″ / 10cm should be needed, unless you are planting the plants directly into the substrate. For best results, add a generous layer of leaf litter on top.
Feces and urates should be removed daily, and contaminated substrate should be scooped out and replaced. Substrate should be completely replaced once every 3-4 months, depending on your needs.
Decorating Your Neon Day Gecko Terrarium
Decorations play a vital role in your gecko’s enclosure as environmental enrichment. Enrichment items encourage exercise, stimulate your pet’s natural instincts, and help promote overall wellbeing. And, of course, they make the enclosure look nicer! Without décor, your terrarium is just a glass box with dirt and a feeding ledge. Just because day geckos can climb up glass doesn’t mean they shouldn’t have other climbing materials available. They also need places to hide that are not on the ground. Neon day geckos are particularly fond of hiding in small crevices!
Here are some ideas to get you started:
- cork hollows
- live plants (ex: dracaena, sanseveria, pothos, philodendron, bromelia)
- magnetic ledges
Arrange these items in a way that encourages your gecko to climb and explore, and provides areas of both light and shade. Artificial plants are best avoided with day geckos.
Feeding Your Neon Day Gecko
Neon day geckos are omnivores, which means that they need a balanced diet of both plant- and animal-based foods to get the nutrition that they need. In the wild, they eat mostly insects, flower nectar, and fruit juice. As pets, this diet can be re-created with a balance of meal replacement powder and live insects.
How often neon day geckos need to eat depends on age:
- Juveniles (0-6 months) — insects daily, CGD every other day
- Subadults and Adults (>6 months) — insects 2x/week, CGD 1x/week
Crested gecko diet (CGD) must be offered via a wall-mounted feeding ledge, not placed on the ground. Personally I prefer magnetic mounts to suction cups.
Best feeder insects for neon day geckos: crickets, flightless fruit flies, bean beetles, rice flour beetles, small black soldier fly larvae, lesser worms
The key to providing a healthy, balanced diet for your pet is VARIETY. Provide as varied of a diet as you possibly can, and you will be rewarded with a healthier pet that always looks forward to mealtime. I prefer to use a rotation of at least 3 different kinds/flavors of CGD.
Crested gecko diet is already fortified and balanced with a variety of vitamins and minerals. However, feeder insects need to be “dusted” with a light coating of calcium powder before every feeding to balance the calcium-phosphorus ratio.
Although your gecko will get drinking water from daily mistings, it’s best to always keep a bowl of clean water available on the feeding ledge. This bowl should be scrubbed out with veterinary disinfectant such as Rescue or F10SC weekly for good hygiene.
Handling Your Neon Day Gecko
Neon day geckos are too small, fast, and delicate to be handled safely. If you want to try interacting with your gecko, I recommend limiting interactions to offering insect prey by hand or putting a dab of CGD on your finger for them to lick.
However, wait at least 2 weeks for the gecko to settle into its new home before trying to introduce yourself.
Baines, F. M., Chattell, J., Dale, J., Garrick, D., Gill, I., Goetz, M., Skelton, T., & Swatman, M. (2016). How much UVB does my reptile need? The UV-Tool, a guide to the selection of UV lighting for reptiles and amphibians in captivity. Journal of Zoo and Aquarium Research, 1, 56. https://doi.org/10.19227/jzar.v4i1.150
Climate & Weather Averages in Hell-Ville, Madagascar. (n.d.). Timeanddate.Com. Retrieved January 4, 2022, from https://www.timeanddate.com/weather/@1076105/climate
General Care. (2017). Phelsuma Farm. https://www.daygeckos.co.uk/general-care/
McKeown, S. (1993). The General Care and Maintenance of Day Geckos. Advanced Vivarium Systems.
Medium UV Species. (n.d.). Arcadia Reptile. Retrieved December 27, 2021, from https://www.arcadiareptile.com/lighting/medium-uv-species/
Phelsuma klemmeri. (n.d.). IUCN Red List of Threatened Species. Retrieved January 4, 2022, from https://www.iucnredlist.org/species/172981/6952389
Rundquist, E. M. (1995). Day Geckos. T.F.H. Publications.
Yellow-headed Day Gecko (Phelsuma klemmeri). (n.d.). INaturalist. Retrieved January 4, 2022, from https://www.inaturalist.org/taxa/34049-Phelsuma-klemmeri
The ReptiFiles Neon Day Gecko Care Sheet is a simplified care summary, not a full ReptiFiles care guide. While I have done my best to ensure that the information contained is accurate, due to time constraints, the research behind ReptiFiles care sheets is not as thorough as the research involved with my full-length care guides. I strongly encourage readers to do their own research from high-quality, reputable sources outside of just this care sheet as part of preparing for your new pet reptile.