My tank has a 1" wide strip that runs along the front and a 1" wide strip that runs along one side of the terrarium. I don't have the intake strip like the European styles do, but it appears to have ideal ventillation for most plants (save a few Tillandsias I have killed). I think as long as you mound the Tillandsias near the top and front of the tank, you'll probably be OK (that is where most of the air currents should be with your vent setup). It sounds like your setup should work, but I can't really know for sure. If your humidity is too low, you can always use a piece of plexiglas, wood, etc, to cover up part of the top vent. I hope that helped!