All I can say as original thread is mine and had same issues and here's wot I did. Got new lights as mine were no use, I realised my LEDs were way too far away, finally lots of organic potash seemed to help. I think mine were like yrs at approx wk 10 from germination. I've used bone meal, potash and a bit of pk13/14 but used this way too early. Mine are doing much better now, still not finished tho now on Wk 12 from germ and prob got another 3 wks b4 harvest. I thought autos were sposed to be quick!It's a learning curve. As I say I'm no expert, don't claim to be but hope that helps a bit