I have a gargoyle gecko all OK last two years but very recently lost weight to point I can see his ribs, his legs and feet are weak. Has wood chip substrate Cork board walls hollow logs and branches. He eats phelsuma mix and locusts mist once day or every other. Approx 25c with heat mat which is turned off at night.
Bump the temperature up to between 26 and 28 C. It's a small change, but 25C may be a bit to cool for Gargoyle geckos. Low temps can affect appetite and activity. The heat mat should be on one half of the tank. Lights can be turned off at night, but the heat source should stay on if nighttime temps drop. Makes sure the diet contains adequate amounts of vitamin D3. Without it, he is at risk of developing metabolic bone disease (MBD). A recommended diet is Repashy Crested Gecko diet. It is a powdered diet that can be reconstituted as needed. It can be found online or in most pet stores. The locusts fed should be gut loaded 24 hours prior to feeding. If he has a healthy appetite, submit a stool sample to your veterinarian or a vet experienced in treating reptiles to diagnose intestinal parasites. An exam with an experienced herp veterinarian would be strongly recommended to diagnose metabolic bone disease and to begin treatment. Supportive care may be indicated in light of the recent rapid weight loss.
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