in the past someone i know used to push 1300 thinking pushing them to the max is the best. Now he believe happy medium, happy roots, happy family tree. He Floods a couple times for a day for o2, and pushed 1k ppm or more on crit kus gth and skywaker kusg and a auto. he said now 800 is max. I heard ghost train hz can handle a larger amount of nutes but turns greeeeeen. Green curls under due to n toxicity, or overwatering, but in the pics- N toxicity. the dark green and curling under should both just be indicators of variables, who cares who is right. learn to read the need, then feed. he said newer growth under lower mix isnt as dark and at a quicker pace. mix potency has a lot to do with medium, watering cycles, and nute compunds in all fairness. each compound affects the plants ability to uptake other compounds in one direction or another, just like ph affects its uptake ability. An excess, or buildup, of one salt usually causes the disruption of another. just because it works doesn't make it the best. so vary the solution up and down and take notes for line of best fit lol. and lastly., dont read the plants under the hps. get a flashlight or 6500k light to help accurately understand what it is saying. not varying the scale by varying the color scale of a 3500k light.
ps these are all salts, does feeding me just salt and now ater allow me to live, no. does feeding me just water no salt work, no. SO I need happy medium. should take you 2 or 3 times tops to know the mins and maxes, if not you have not done it right lol.
water/nutes, medium, air flow, temp and light. it will grow with highly varying amounts of any, but will blossom in the right mix of all. fuck pests.