Yep, to me it looks like Mg deficency, maybe some other metal like Cu.
Flush and a good feed should help.
Does it show on older leaves only? Again, check the temperatures(especially night temps) maybe it's just that.
Yes it's only on the older leaves and I don't think it was any type of kush I don't really remember the weed it came from but it was probably some high grade mid cuz that's about all that goes around here I don't buy bad mid and I can't afford Loud. I'm thinking it is a magnesium deficiency. How much water should I use to flush it with I'm not positive but I think these pots are 3 gallons and I have Cal Mag but should I just use epsom salt because I have that too it won't be too much longer before I'm flushing for Harvest. And thank guys you for the feedback