Ok Im going to add my 2 cents now. I dont beleive that crix are a bad food for geckos but giving them a varied diet is definitly a good thing.
This is my main concern for your leo and that is the temps? Do you run the lamp at night and if so is there a hide on that side of the tank?
The reason I ask is that leos are nocturnal creatures by nature and I imagine tht you feed them in the evening or the night time hours. That is when the leo needs the 88-90 degree temps to digest its food. Also the heat helps to stimulate his eating aswell. If I were you I would keep the UTH in the 88-90 degree range 24/7 and use the lamp for keeping up ambient air temps. If you keep an area that will always be in that 88-90 degree range he will always have a place to thermo regulate for health and digestive purposes.

Good luck!

M
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Mike & Wendy

1.0.0 Siberian Husky
0.0.1 RTB
0.0.1 Ball Python
1.1.0 Leopard Gecko
1.0.0 Beardie
3.1.0 Future Herper's

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