I'm wondering if you will need a carbon filter for an attick, would the smell just rise along with heat or will it stay trapped and just boil into an out of control heap of ganja reak. would the best thing doing it open in the attick or in a concealed box with a cabron? is the carbon filter good enough to hide the smell from the next room over or does it just help contain it in the household? Also what is the prime amount of plants for 400w MH? one more thing, i'm not sure if i should start with hydroponics or not. I kind of want to build some bubble buckets but i'm not sure if it will be worth it for first grow? Should i do it old school and stick to soil or go hydro?