Sweet thanks for the photos man.
your doing good,always start off with weak nutrients and work your way stronger if the plant can handle it.
that being said what brand/s of fertilizer are you using?,there may be an imbalance or deficiency
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how often do you water,and how often do you fertilize?
also doubt you will have heat issues with cfl's but I would recomend a small fan in taking fresh air and a small fan pushing out stagnant old air