Yep, like @vostok said, watch those nitrogen levels. That's probably why your girls are so dark green, that dark green is usually indicative of nitrogen toxicity. I haven't used dyna-gro, but I'd think you may be overfeeding them. I always used GH Flora Series as it gives extra control over various aspects of plant nutes. Anyways, that exhaust vent should be attached to a cool tube or whatever hood you're using. If you have enough money, make sure you get a carbon filter as well (if smell is an issue for you, if you're not in a 420 friendly state, it had better be on your mind). Here's a pic of what your ventilation might look like after you've done it right (this 2nd pic doesn't show a carbon scrubber, fyi). Your inline fan should be sucking air OUT of the hood, not blowing air through the hood. Here's a couple random pics I found that might give you an idea of how it works and what it should look like. Notice how the inline fan, which is held up by yellow straps in the first pic, is NOT attached to the hood. This grower probably thought it would make it easier to raise and lower his or her lights. Good luck, buddy.
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Thanks man That's a nice looking set up. I'm told I should not cool/vent the Gavita light at all but I see no real reason why a set up like this wouldn't work well. I'll be adjusting a bit trying to set up smartly a little at a time.
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