Crested Gecko Not Eating? Weigh It Before You Panic

Grams, not days

The reason "my gecko has not eaten in five days" is such a weak signal is that you probably did not watch it eat. Crested geckos feed at night, slowly, and a lick or two out of a dish of prepared diet leaves the dish looking essentially full. Dried edges, a slightly smeared surface, or nothing visible at all are all compatible with a gecko that ate.

A scale removes the guessing. Weigh the gecko on the same day each week, in the same conditions, and write the number down. What you are watching for is the trend across weeks, not the reading on any one day. Small fluctuations are meaningless; a single dropping can account for a gram or two on its own, so a gecko that reads 44 grams one week and 43 the next has told you nothing.

What matters is direction. A weight holding steady, or creeping up in a growing juvenile, means the animal is eating enough regardless of how the dish looks. A weight that has fallen week over week, or is more than about ten percent below where the gecko was, is the signal to act on. That is the whole diagnostic, and it costs less than a bag of food.

When not eating is normal

Several kinds of fast are expected and do not call for intervention, provided the weight is holding.

• A new gecko settling in. This is by far the most common case. A gecko that has just moved home is dealing with unfamiliar smells, light and space, and many will not touch food for a week or more. Some hold out longer. Leave it alone, keep the enclosure right, and stop handling entirely until it is feeding.
• Shedding. Appetite often drops around a shed and returns once it is done.
• Breeding season. Adults, especially females, go off food seasonally, and males can lose interest for stretches in spring.
• A cooler period. Metabolism tracks temperature. A gecko in a cooler room eats less because it needs less, which is normal within the right range and a problem below it.
• Holding out for something better. A gecko that has learned insects sometimes appear will occasionally ignore its dish waiting for them. In a gecko whose weight is holding, that is a training problem rather than an illness, and the answer is to stop rewarding it. Note this flips entirely once weight is falling: at that point a higher-value food, including insects, is a tool for getting calories in rather than a bad habit.

Husbandry first: temperature

Temperature is the most common husbandry cause, and it fails in both directions. Too cold and the animal's metabolism drops and it stops being hungry. Too warm and it becomes stressed and stops eating, which is the more dangerous failure for this species. Keep the enclosure at roughly 70 to 78 degrees. A small warm zone at the very top of a tall enclosure can read into the low 80s without harm, but sustained whole-enclosure temperatures above the low 80s stress a crestie, and the mid 80s can be fatal. If your room has been hot, deal with that before you touch the food, and see our crested gecko humidity guide for how the two interact.

Then hydration and the humidity cycle

A dehydrated gecko does not eat. Crested geckos drink droplets off leaves and glass rather than from a bowl, so a dry enclosure quietly starves them of water even with a full dish sitting there. Run humidity as a cycle rather than a fixed number: a heavy evening misting that spikes the enclosure into the 80s, then a real dry-down toward 50 percent through the day before you mist again, keeping the overall band between 60 and 80 percent.

Two things go wrong here. An enclosure that never dries out breeds mold and causes respiratory problems, which suppresses appetite for a different reason. An enclosure that never gets misted properly leaves the gecko with nothing to drink. A gecko that perks up and eats within a day of a proper misting was telling you it was thirsty, not fussy.

The food itself

Prepared diet is not all the same to a gecko, and a batch that has sat open too long loses its appeal. Mix it fresh and replace it every day or two so it never skins over. One trick from keepers is worth adopting: mix it slightly thicker than you might think and put down only a few dollops, because a thicker surface holds tongue marks. That turns the dish itself into evidence, and it is the fix for a gecko eating amounts too small to leave any other trace. Flavor preference is real and worth exploiting, and swapping to a different mix is the cheapest experiment available to you. Our crested gecko diet guide covers the brands worth keeping in the cupboard.

Placement matters more than most keepers expect. Cresties are arboreal and prefer to feed off the ground, so a dish sitting on the substrate asks the animal to go somewhere it does not want to be. Mounting the dish partway up the enclosure, near cover the gecko already uses, asks less of the animal than a bowl on the substrate does.

Security, clutter and being watched

If two geckos share the enclosure, separate them before you troubleshoot anything else. A bullied or outcompeted animal quietly stops feeding, and no amount of flavor-swapping fixes a roommate. Beyond that, a crested gecko that feels exposed does not relax enough to eat. A sparse enclosure with a couple of branches and bright light overhead is a stressful place to be, and the fix is clutter: foliage, cork, vines, and enough cover that the animal can always be hidden from view. Aim to obscure most of the enclosure rather than decorating the corners of it.

Handling works against you here too. A settling-in gecko or one that has gone off food should not be handled at all until it is eating consistently. Standing and watching the enclosure at night has the same effect in miniature. Put the food in, leave the room, and check the scale at the end of the week instead.

Do not hand-feed

Hand-feeding is the intervention keepers reach for first and should reach for last. Geckos learn quickly, and one that gets fed off a fingertip can start holding out for that rather than eating from its dish, which turns a temporary problem into a permanent routine. It also masks the signal you need, because a gecko you are feeding by hand is no longer telling you whether it would eat on its own.

The exception is a gecko that has lost significant weight, and in that case the instruction should come from a reptile vet who has examined the animal, alongside whatever else is going on. Assisted feeding is a treatment, not a first response to a full dish.

When it is a vet visit

Book a reptile vet if the weight is falling week over week, if the gecko has lost more than about ten percent of its body weight, or if refusal is paired with lethargy, sunken eyes, a kinked or rubbery jaw, or a gecko that no longer climbs at night. One sign overrides the weekly-trend method entirely: if you can already see the ribs or hip bones, or the limbs look thin, do not wait for a second data point. That gecko is behind, and the appointment is now. Be careful with day counts, because they are the least reliable part of this. Keepers and vets disagree about them, and you will see both a ten-day rule and reports of healthy geckos fasting well past it. Our position is that the day count is a prompt to look, not a diagnosis: it is refusal combined with weight loss that matters. Juveniles are the exception worth hurrying on, because they carry far less reserve than an adult and a falling weight in a young gecko should not be given weeks to declare itself.

The reasons a vet can find and you cannot include parasites, impaction, mouth infection and metabolic bone disease, none of which resolve by switching flavors. If your husbandry is correct and the weight is still dropping, that is the answer: it is not the food.

Our call

Buy a scale before you buy another tub of food. Weekly weights turn an anxious guess into a straight line you can read, and and in our reading of these threads the usual outcome is a gecko that was eating all along. A steady weight buys you patience; a falling one tells you to stop experimenting.

When the number does fall, work in order: temperature first, then hydration and the misting cycle, then a tankmate if there is one, then the food and where the dish sits, then how much cover and how little handling the animal is getting. Run the vet alongside that rather than after it. If the weight is still falling once the temperature is right, book the appointment while you work through the rest, and go straight there if the gecko already looks thin. Leave hand-feeding to a vet as well. That sequence solves the large majority of cases, and the gauge that catches the temperature and humidity problems earns its keep long after this particular scare has passed.