Well despite the "flush" controversy I am flushing and I noticed how much salts were in the medium while measuring the EC & PH of the run off. Not sure if it's a waste but have been PHing Input water to 6 and using molasses, yucca, enzymes and aminos, Input EC = 0.1. Output PH 6 EC 0.3. I'd like to get the run off to under EC 0.1. Leaves are fading to yellow. Room smells wonderfully skunky and orange variety is really orangey and lemon variety is really lemony so I am really smiley😀. Trichomes are cloudy on the buds with some amber. Some plants are further along, some plants should have more feed but I need the room and have cut them off (poor bastards) their getting flushed too. A couple more flushes I figure is all they'll get then chop chop.
Looks like issues in the root zone. Test your runoff. I would bet the ph is in the 4.5-5 range. This will affect the uptake of nutrients the plants need in flower.
Thanks Kush-queen, DoctorGreenThumb, and StaresAtPlants for your answers. Seems like the leaves come from both top and middle of plant. Run off is 5.4, 5.5, & 5.7 for the different trays. PH going in is 6.0. Plants get watered with RO water every night, I run 6.0 PH, temp 23 EC between 05 - 1 or 500 - 1000. Get plenty of runoff.