yellowing tips and edges.. cal/mag def or (k)

4 white rhino's from clone 6 weeks into flower grown in happy frog soil, fed with ff trio .. 600 watt hps aircooled hood 3x3 tent 74-79 degrees, use phed tap water ph it to 6 .. runoff is 6.5 ph .. cant really tell whats wrong if its cal mag or (k) if they were ur plants what would u do

from the guides it looks like potassium defency or cal mag but i cant tell what, the hole damn plant is yellowing but its turning more of a pale green than a yellow it might be a mix between them both, but i have no idea what to even try, i got beasty blooms chaching and open sesame hopfully the cha ching with small feedings will help is my npk, but from the looks of them should i order some cal-mag?

I've got the same problem, trying to figure it out as well. I was thinking phosphorous... But someone told me mg lockout. I'm still waiting for some help. Check my thread out ---- https://www.rollitup.org/marijuana-plant-problems/708566-looks-like-p-def-me.html

If I get an answer ill definatly send it your way too

sweet man, mine are just weird, they look like a nitrogen def too there just so damn light green, some of the leaves went all the way yellow without getting burnt tips and sides too, so idk.

Could it be from molasses

i have used a little molasses a few times, normally 1 out of every 3 watering could it be causeing this?

kinda looks like a nitrogen def too though, i didnt feed it veg nutes the 1st weeks of flowering either, could the plant just need nitrogen at this late in flower. now i just use tiger bloom mostly.

fixed pics