Yellowing along edge and light green...

One of my plants is light green and yellowing along the edge of the leaves. The soil is supposed to be PH balanced so it has to be some sort of missing element. The other
2 plants are dark green but yellowing along the edge. If it needs some mag. or calcium
couldn't I just put a little unsulphered mollasses in my feeding? Sorry, no camera to post pic. The light green plant is Barney's LSD and the other 2 r Kannibia power skunk and special fem.

Nitrogen deficient dude, not all strains grow the same

Thanks, but what about the other strains? Dark green and yellowing slightly along
edge. The edges of the light colored plant are curling down as if it's burning. It's 2.5-3" away from CFL's.

Yellowing on leaf blade edges usually means one of two things. Most commonly, it means Potassium deficiency and the leaves might look something like this:

View attachment 1430822


Much less common is Zinc deficiency, which will look like this:

Yup, I would say it's a potassium deficiency. I gave all of my plant's my usual feeding and some unsulphered molasses last night.
Do you think that will clear it up?