Indoor HELP! Starting to flower aaaand...Brown spotting, yellowing and browning bottom leaves

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Coco, 5 gal. smart pots, spyder farmer 1000 ledx2, fox farm trio, and cal mag+. I run my ph at 6.0 to 6.2 and ec has been from .4 to .6 so far. I tested run off once and it was at 6.5. I started off the grow adding 1.5 ml of grow big and 1ml of calmag+ but nothing else. After the stalks beefed up and turned green I went to 2.5 ml grow big and 2ml of calmag+. As they revealed their female gender I swapped from the grow big to the buds and blooms adding 2.5 ml of it, 4 ml of big bloom (plant food), and 2.5 ml of cal mag+. All of that is per gallon of water. I hand water giving 3-4 gallons to the four pots every two day. I am running 24/7 lighting and do have air exchange. Temps and humidity are within range 85% of the time and only temp getting a little too high like up to 81°F but the temperature is kept around 74°F otherwise. The plants grown are gg4x2, dark devil, and blackberry. The blackberry has been a goofed up looking plant since it broke soil ( just a figure of speech considering the coco). I do have pictures from throughout the grow with a week or so missing if needed.

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im seeing a few issues. hard to tell if its a lockout with the low ppm.
how far up are the lights?
one looks light stressed with the leafs that are taco'ing.

the one with buds looks really rough. like it is fried to death.

how often are you watering the coco?
 
im seeing a few issues. hard to tell if its a lockout with the low ppm.
how far up are the lights?
one looks light stressed with the leafs that are taco'ing.

the one with buds looks really rough. like it is fried to death.

how often are you watering the coco?
2-3 gallons every two days to all four pots hand watering
 
2-3 gallons every two days to all four pots hand watering
One second and ill get the gap between plant and light for each but i believe the tallest plant is about 15 inches from light mabye less they have grown alot over the last two days
 
One second and ill get the gap between plant and light for each but i believe the tallest plant is about 15 inches from light mabye less they have grown alot over the last two days
raise it up to like 28 inches lol. them leds are potent.
 
14 inches is how close the tallest is... 18 on the next and the other two more
 
:toke:-- all this goes down to running coco like true soil, which coco is literally the opposite of,... it's a specialized soilless medium, far more bitchy than peat based soilless (Promix, Sunshine) full of do's and don't's...Read up on it in the coco section, too much to address here....
I suspect you have a salt build-up in there,kicking off K toxicity among other things,...
You'll need to carefully monitor pH and ppm going in, and coming out, about 15-20% run-off each time... but first, the pH is already off in there, run-off alone under such nute loaded coco is inaccurate, and is too high regardless (6.0-ish for coco)...
I'd try to reset the whole mess in there with a flush, which in coco, can't be done with water only as you'll see when you read up on why...
use RO/Di water, 150ppm Ca-Mg, plkus another 150ppm base nutes, 6.0 pH; pour through until runoff is at or near input values,... with some luck, this will have purged the excess nute salts out, rebalanced the nutes in there, and fixed the coco's CEC buffering with Ca and Mg....
 
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