now my set up is a little different...im in a closet 3x3x8 2 fans one blowing in one sucking out one 400 mh for vegg I have 5 plants in 3 gal buckets mylar everywhere . I top the plant directly under light let it bush and keep turning the other 4 around it ....no problems here.... it does stink though I have a homade carbon filter under house where my exaust blows through floor...lol grow room is air tight if fans are off ... I use co2 also but I aint even getting to all that ...lol...have fun peace