This is my first time growing, but it looks like it went horribly wrong. The strain is quick one from RQ seeds, I bought 3, 2 survived, 1 didn't germinate. I planted them 2-2.5 months before taking these pictures. First weeks I think I had problems with poor light and some rather cold temperatures (18-22 degrees celsius). They grew tall, but weak, so I tied them up, after I put them on the balcony on the sun, they started growing a bit better, but now the leaves started becoming yellow from tips up and the first leaves affected were the oldest ones (on the bottom). What am I doing wrong? Why is it taking so long to fully grow when it's a very fast growing strain? What can I do in the future to avoid these problems?