pics 1-4
geez shes a hot mess you need to prune her and tie her down she looks like a nappy headed hoe
pics 5-6
need to veg longer you'll be dissapointed with harvest when you flower this small also needs more light
pics 7-8
over watering also more light blue spectrum 6500k
pics 9-11
Mooore light add more 6500k less 2700k put lights close this baby is stretched i don't think i have ever seen this badly streched.
Should i pull yellow and burned leaves?
no
i just went back and read that you're using a 600w hps that will work but you need to move the light much close from the looks of things you have the light so far away they are not even being effected by it
View attachment 2722053
also add some 6500k and they won't be so lanky more foliage growth means more bud sites means more bud this way you may get one bud the size of a basketball but what good is smoking you would have to have it mounted to a trophy