Hi guys, doing my first grow with single plant. Not sure about how it is currently growing. Seems slow compared to a friend's (we started same time), my plant is much smaller and has both curling leaves and brown parts on some leaves. The Browning started on lower leaves and has moved up the plant. Its been 5 - 6 weeks from germ and I started using tomato feed 3 weeks ago. Picture tells a thousand words. Was wondering if you guys had any advice? Cheers in advance.