Hey dude CalMag is a nutrient. Normally tap water has plenty of both, but distilled and Reverse Osmosis (RO) water don't. Both are essential for growing cannabis. You can get it easily at garden centers, Wal-Mart even has it I think.

They look indica dom (wide leaves), so should flower in 7-9 weeks.

As for the bunched up leaves, those are new growth tips, perfectly normal. They will eventually support more flowers. I like to bend my plants so that the top is parallel to the ground and more light gets to those lower shoots. It's called LST (Low Stress Training). More info in the first link of my sig. You can see examples of LST and Scrog training in my grow logs (also in my sig) :thumbsup: