Hey guys. I'm making the move from a glass tank to plastic tubs and was just wondering if any of yall had any tips/tricks to building a new enclosure. I've had humidity problems in the past with the glass tank, and a lot of yall recommended plastic tubs instead.

Where's the best place to drill the air holes? (top/bottom)
What kind of UTH's do you recommend? (I think the one I have is a ZooMed uth...sadly, no thermostat yet...)
Just got a new digital temp and humidity gage
Been using Aspen bedding (Recommend any other kind of substrate?)

Any other suggestions welcome! And thanks for all the help!!!