Your leaves are toast. What ever you are doing with your fertilizer is wrong. Look at the leaves near the top that are yellow, spotted, curled, brown and just sickly. Go to google and type in some of the symptoms. Like; "brown spots, yellowing upper leaves" and read. Or look up nutrient deficiencies and read the signs and how to correct them.
I would tell you but for one, I don't know. And two, finding stuff on your own is much better for retention and leads to greater understanding. The whole "give a man a fish" thing.
That cola looks nice though. Get a magnifier and look at the trichomes.