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I think it's lacking nutes, seems like you may want to start a light feeding they are starting to grow up. A very light feeding 1/8 strength or 1/5 strength. Seems like it's it good health, just a lack of stored nutrients are killing the eldest leaves on her. This is where you will gain lots of...

No it is being sucked through the light and outside the grow tent. But it still does not seem like enough ventilation, I was thinking I could run the light exactly like you said and just add the 4" fan/filter combo in addition. Let me know what you would prefer and why.

The grow tent is an unfamiliar size, at 2x3.5x4. I've got a 400w ML (cool tube) and a couple of the 26w high output cfls for veg. The space gets really hot so I've ordered a 4" centrifugal fan and carbon filter to aid my 6" duct booster I'm already using. My question is what would the best way...