Well it's true anything is possible!! I'm going to let them dry up more than I usually do, I've never heard someone say they hate fabric pots! That's a first, but everyone likes thing the way they doHarder, but possible I think... I personally hate fabric pots because I suck at gauging the water with them... I actually took mine out of them and put them in the ground... and yes they dry out fast, especially outside. Maybe someone else with more experience with fabric pots will chime in... I had 15 gal ones so I can't say how often smaller ones need watering, especially during flower. I just know when my outdoor babies get too wet, leaves yellow and drop.
Yes, they are 60 days since sprout today and flowering for about 2 maybe 3 weeks, I now know where I messed up, I never upped my nutrients at all since beginning in veg with fox farm trio, grow big at 1/4 and big bloom at 1/4, and tiger bloom at 1/3 (since pre flower began) watered each plant half gallon with those mixtures, now I know I need to up the bloom nutrients to at least 1/2 my next feeding and then 3/4 my next. I believe I starved them so they ate themselves up????Looks like a K deficiency IMHO.
Older leaves turning pale, though it has what appears to be high N, looking at the plant on the right in the last pic and how shiny and green the leaves are.
Pull off a couple of leaves (both yellowed and green) and see if they snap right off, like the leaf stem is brittle. A really good indicator.
It doesn't look like its a Mg issue. Look at the stalks and branches, there is no purpling in them. a sure tell of a Mg issue, though a little Epsom salt isn't a bad thing deficiency or not.
There could be light bleaching at the top, from the lights being too close, but these plants are probably in week 5-7 and looking hard for K now and that will continue to ramp up till they finish.
Might want to check the nutrient ratio's.