Help with growing issue

[Pkgump]

I have a plant that almost all leaves have turned yellow. I control everything. My water ph is always 6.4-6.5. I’m on a 12 hour light cycle. I use foxfarms tiger bloom and grow big as directed. they are watered around 2-3 times per week. I keep the temp. Between 68F and 75F. I keep the humidity at no more than 45%. There are no parasites. I pump co2 in the grow tent. They started turning about 1.5 - 2 weeks ago. Any help will be very appreciated.

[Gingerbeard]

You're good. Your plants are in late stage flowering and the leaves are having all the nutrition sucked out of them. Imagine what trees do in autumn.
Real good looking flowers!

[Puglover1]

Pkgump This was one plant from my 1st grow. The last pic I took before I harvested the mature top halves of three plants. If a visual helps? Your plants look healthy, nice buds.

[Rwise]

I agree, looks nice, I would suggest raising the PH to the 6.5-6.8 range while in flower.

[OldManGrower]

You're fine no worries. You do show some indication of nutrient burn but there isn't much you can do about it at this time.

[SwitchH2O]

You're fine no worries. You do show some indication of nutrient burn but there isn't much you can do about it at this time.

I agree with the old man; looks like you were in burn mode for some time. Do you “flush” your plants? I’d pick off, “prune” the dying leafs off… it’ll give you something to do and help with less pruning upon harvest.