Setup
The numbers
Thermal gradient
Day: a real gradient, 29–32°C warm against 25–28°C cool, so the animal chooses. Night: 23–25°C.
Why
Same scale on every sheet here, so two species compare by eye.
The sheet stateswarm 29-32 °C / cool 25-28 °C / night 23-25 °C
Humidity
The sheet states40-75%
UVB
The sheet statesUVI of 3.0-4.0 in the basking area; Arcadia ShadeDweller Arboreal kit — 4-6″ / 10-15cm; Arcadia Forest 6% UVB kit — 7-9″ / 17-23cm; Zoo Med T5 HO Reptisun 5.0 — 7-9″ / 17-23cm
Traceable. The figures above appear in the page we cite, which we opened on 10 Aug 2026. That means you can check them, not that we have confirmed they are right. reptifiles.com
Drag the sun. The sheet states a night temperature, so the rail follows it.
Enclosure and conditions
Enclosure
Drawn from the stated numbers. Only what the sheet states is drawn inside.
Why
The rectangle carries the exact width-to-height ratio of the figures above it, and the ruler under it places that width on the 0–250 cm scale every sheet here shares, so two species still compare at a glance. Nothing is added that the sheet does not name: a lamp drawn on a sheet that never mentions one would be invented equipment. What the sheet leaves out is listed rather than left blank, because an empty tank reads as « none needed ».
The sheet statesminimum recommended enclosure size for a single giant day gecko is 24"L x 24"W x 48"H / 60 x 60 x 120 cm
What your climate adds
This sheet states a range to hold. Your local climate decides how much work holding it is. Pick the nearest city: nothing is sent anywhere, the choice stays in this browser.
What it needs
Every line above is deduced from a value this sheet states, and names which one. Nothing here is a general recommendation.
Food
Diet
Feeding rhythm
Twenty-eight days, one row. Each band is a meal window. This sheet states a figure for each age, so each age has its row.
Why
The windows widen as they go because the interval is a range: four meals after a 10–14 day cycle land anywhere between day 40 and day 56. A young animal's row is drawn only where the sheet gives one: working it out by dividing the adult interval would be inventing a ration.
The sheet statesJuveniles (0-6 months) — insects daily, CGD every other day; Subadults and Adults (>6 months) — insects 2-3x/week, CGD 1x/week; crickets, dubia roaches, discoid roaches, red runner roaches, red head roaches, grasshoppers/locusts, hornworms, silkworms
The species
Identity
Good to know
- A diurnal gecko that laps nectar and fruit like a tiny sunbird.
CITES II is a global listing and holds in every country. National law is not global, and we hold no national wildlife law for any country, Thailand included. Check your own authority before buying or selling.
Questions & sources
Common questions
Does it bite?
An adult male can, and it is sharp enough to break skin. They are bold rather than shy.
How big does it get?
Up to about 25 to 30 centimetres, the largest of the day geckos.
Can I handle it?
Not really. The skin is delicate and they move fast. Treat it as a display animal.
Can I keep two together?
Never two males. Even a pair needs a large planted enclosure and watching for bullying.
https://keepr.pet/husbandry/en/phelsuma-grandis
Others in this group
What this sheet states
This sheet states 6 of 7 of the fields this product runs on. What is missing turns something off: day/night engine and awake count on the globe. We show the gap rather than fill it with a plausible number.
UVB is measured but does not count: it is absent from 420 of 678 sheets, and on most of them that is not a gap, since a nocturnal snake's sheet has no reason to state a UV index. Counting it would call the library incomplete without cause.