Spots on leaves

And to your point about feeding half dosage.. that doesn’t always matter. A recent grow of mine, because of a few factors was building up salts extremely quickly in my coco even tho I was only feeding about 1.0-1.2 EC (5-600PPM) it would build up salts within 5 days that it was having run off of 5.0 EC (2500 PPM) It was insane but it was due to several factors I won’t go into at this point.

It looks like you got N toxicity going and excess N is gonna cause lock out of calcium..

1000 ppm runoff is to high as mOuse says. If you want a proper ph ec schedule for your next grow, look to my M.O.A.B dairy. It's a soilless grow., only difference from coco to peat moss is coco needs some cal/mg and more frequent waterings. For proper care of your soilless grows you really need an ec ph reader.

I give only half of the recommended dosage (advanced nutrients sensi coco bloom A+B 2ml/l).