I'm sorry if I missed it but, how did you work out the passive intake on the tent?
I ended up leaving the panda plastic just above the floor around the bottom of the tent (around 1/2" off the floor in general). I've attached a couple images showing the bottom of the tent - I stuck a pen under the gap to give an idea of how low the plastic goes.
As you can see from the attached images the bottom shelf of the tent covers most of the tent area so very little, if any, light that gets in through the "intake" can get up to the plants.
I've basically completed my first grow in the tent and have to say it has definitely done its job well