hey trial and error i saw your post thought i would read it and drop a line...looking good very stealthy hopefully that 70 will get you some bud at least so its not a total waste i also can't wait to flower my babies a week or two left, check it out if ya got time ill scribe..thats crazy about the little grub never seen that type before i just got rid of my gnats (knocks on wood) which loved to eat my plants, damned bastards...neways lookin good keep it up o and as for the exhuast i would leave it how u have it pulling air outta the box through the carbon scrubber is your best bet plus it will save u the space needed when them ladies, hopefully, need the room for buds..take it easy keep up the good work...peacez