I actually did buy a pretty big airstone, I think it's a medium size from a hydroponics store near by. And yes I'm using rapid rooters surrounded by clay pebbles, but the pebbles aren't interrupting the root growth because I only set them towards the top of the rapid rooter more so it can't wobble around the net pot, it jams everything nice and tight. Anyways, I have my box propped open like I said and I guess SOME of the light escapes, but not much.. The plants are taking tons of direct lighting from the led I think. I'm only going to have the box open and running the fan for about 4-5 hours a day, then closed and full light spectrum the rest of the 12 hours or so. I'll bend the plant a few times with my fingers when I can to get some extra strength training