please help asap

Why are just the trim leaves curling? No bugs I've checked well none that I can see ...no spider mites...I have co2 going and the temp stays between 80 and 90 which I heard is ok if you have co 2..but yea I was just wondering why only the trim leaves are warping and not the dan leaves or secondary leaves?
 

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I'm no expert just my opinion, but those leaves look weird.. really dark green and plastic looking or something.. that's a to much nitrogen symptom I am pretty sure. Explain how to use less? I can't even think how to explain something that simple.
 
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