If you did a hood on top of the tank you could suck all the humidity out and direct it outside.
I evacuate my hood and the fishroom air directly outside. This way my 700g+ of total water volume adds 0% humidity to the house air.
They key is sizing your evacuation fan for a slight negative pressure in the room and hood. Some people really don’t like hoods but if your interested I can post a few photos.
I really don't want a traditional hood sitting on top of the Aquarium. I am envisioning an open-top design. However, i am considering hanging lights/fixtures above the display. Perhaps i could incorporate some active air evacuation above the lights in a hood format (stainless perhaps?). This probably wouldn't be very poor with respect to containment though. Thoughts?