I'm stumped...

A few pics of the garden. Just pot the giant GDP in a huge coffee sac. Filled it with coco! The 6k room is I it's last round it's all gsc. Several phenos a and a couple crosses, gdp x gsc, white widow( for fun), blackberry kush..... The smaller 4.6k is all GDP, pre98 bk, juicy fruit, boy scout cookies and some others.

1/4 AN nutes doesn't sound like much, but if it's given more than it should it becomes too much. usually when the condition is low fert, the leaves go yellow, but we don't see much of that here. instead what we see is a largely green plant with dying leaf tips. this usually means over fert. there is the same condition on adjacent plants leafs. green color with dying leaf tips. can only tell problems with pics in white light.