Glad to see that you're going to be separating the species of frogs that's always a good thing to do.
Since I've been keeping frogs I've kept Whites and packmans so far.
Both of which have been EXO Tara terrariums.
And have had excellent results with having a higroterm HT-10 controller controlling heat mats(placed on the sides) and a combination of ceramic heat elements and infrared bulbs with a zoo med repti-fogger.
And to keep the temperature humidity stable I have experimented with covering the screen with pieces of clear Lexan.
I've been able to keep the enclosure stable and only use about liter of distilled water per week.
If you plan on buying any of the above equipment I highly suggest that you get it from Amazon and not from a big box pet store Amazon will be vastly less expensive.
I bought the controllers for less than $40US a piece and also the foggers for about the same price.