What kind of cage are you using? If it's a glass one with some kind lid that is on top of the cage that is made of some sort of mesh you will need to do the foil mod. You are losing both heat and humidity through the lid. Yoit heat lamp is also drying the air out as well. The foil will trap the heat and a large water bowl will at the heat to create the humidity. You can control the humidity by now close the water bowl is to the heat lamp.

If you try this you should not need the moss.

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