Overwater in coco? Over Nute? Sativas in Coco Coir. . . (pics)

Farmer CBD

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Having some issues growing sativas in coco coir for the first time. Growing in coco period for a couple years. Picked up some Golden Goat clones, transplanted them in 1 gal pots, then to 4 gal pots, and I'm in week 4 of veg. Feeding them with the full House & Garden coco line, except I use Hygrozyme instead of their MultiZen. RO water with 20% runoff.

They just seem weak, lack vigor, and aren't taking the nutrients like the indicas are. One of them is showing some burning on the leaves, the others look like they may be in the early stages following that. This is my first time growing a sativa plant in my garden, any advice on what I may be doing wrong would definitely help.

More details. . .

76ish degrees F/ Day, 72 degrees F/ night, around 50-60 humidity,
Flushed Coco Coir 70/30 perlite with well water ph'd to 5.8, but forgot the calmag. (Not dry when transplanted, then watered with 1/2 strength nutes)
Raised the PH to 6, and 6.2 from my usual 5.8, thinking it was a calmag deficiency, nothing changed.
I've only added molasses (4ml per gal) one time (week 3) no difference.
Feeding at full strength 600-700 ppm every 4-5 days on 750 Watt MH's (coco still damp, not dry at all)
Runoff Ph is about .1 or .2 lower than whats going in, Runoff ppm is relatively close to whats going in.
Using a cheap $20 yellow milwaukee PH stick meter, have the better Milwaukee model MW102 on its way from amazon. .

I find it strange my plain RO water is 8.1 Ph/ 32ppm before I add my A/B nutrients, then it drops exactly to 5.8 right where I need it to be. What is everyone else' Ph of their plain RO water?


Anyways, Here are some pics, the last one is one of my Indica strains (loose grapes) still a bit light green for my liking, but not as ugly as these Sativa's. Constructive criticism welcome! :P
 

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