Well my curling is due to closeness of the light source. It's less than 1 foot right now b/c of how tall the plant has gotten. Also, my fan was turned to a low setting and pointing in a weird direction. I pointed it to blow exactly between the tops and the light and turned up the fan speed. They're looking mighty fine this morning. Grew again, the one on the right is trying to escape the confines, it slapped me in the face this morning. They're eating an amazing amount of nutes right now. In 48 hours, my nutes went down from 2 EC to 1.4. The curling I have is not b/c of overwatering (can't overwater rockwool) nor too much nutes (leaves are perfectly green). It can be due to salt formation in the rockwool medium (solution is to flush) or if the leaves are curling up (as a few of mine did a few days ago) it's too much heat and most likely b/c the light source is too close (mine is a 600W HPS). I'm not worried now, they got a couple of weeks left! The waxy appearance I think is due to different strains. PS Thanks for the compliments...if anyone has any questions, PM me or rw expert NGT (nongreenthumb), i'll be glad to help.