Well apart from what you've already done ( foil taped to cover ) I guess all that's left is to spray the viv well each day ( morning and evening ) maybe more on the cool side ...
Is the ceramic on the cool side a MUST or could it be removed or even have a lower strength bulb
I have quite a few setups with ceramics and they are a nightmare for keeping the humidity levels up sadly .
Maybe an extra water bowl or one larger bowl ??
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