Sounds like you have everything squared away pretty good, yes humidity is going to be a battle. You could wrap the top with foil except where your heat lamp is and leave like a one inch gap in the foil on the opposite end to allow air flow/ventilation. As long as you keep a humid hide moist with some spagnum moss on your warmer end and remember to mist your enclosure once or twice a day you should do fine. Tubs make it easier tho
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