An Under Tank Heater is best with a Whites Tree Frog because it can stick on the side of the tank. It will warm the tank and if the frog wants to go on that side to warm up it will and it will jump off if it doesn't want to warm up anymore. Peace lillies and pothos are great plants. You can buy a misting system if you want so your wife doesn't have to mist anymore. The temperature needs a day temp of at least 80 or more all year and can go down to the upper 60's. Humidity I feel is best tropical like 70 up. They are very hardy. You should get calcium dust and get crickets and dust the crickets in the calcium so the frogs can be healthy. Feed the crickets fruit and fish food at least a day before feeding the frog so the crickets are nutritious. I'm confused on your proposed building plan. You can also pick up special lights online or at a pet store. I recommend the Exo Terra UVB lights. They are very bright. You can buy hygrometers online too. They will show you temp and humidity. If you need more help and advice let me know.

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