Added more additives to my nutrient regimen and stopped using Mammoth P. Was getting slight leaf canoeing on a couple of the fan leaves, but I think I got it under control. And I also stopped giving them Cal/Mag just because Aqua Flakes has enough Cal/Mag in it already. I ruled out a couple of things that could be causing the leaf canoeing/curl. It wasn't heat nor was it a humidity problem. It could have been the Cal/Mag, or Mammoth P. or a pH problem. Because I was getting some pH fluctuations for a couple of days... I'm back on track and the plants are thriving growing really fast and eating their food like they should...