Friends, tell me what's wrong with these clones?

The yellowing starts from tips and works its way to the tips. This is telling. Often such problems may start as one thing but lead to many others. You seem overly concerned about the electrical conductance of your run off, what about the 9 cardinal rules for plant growth? Are they all being met? If any part of the process is restricted to 10% the entire plant and all it's processes run at 10%. I'd say nitrogen deficiency, starts at tips, works its way inside, seems to effect lower leaves/older first, with upper growth greener. Right off the bat tho your leaf span has already greatly exceeded the pot. Good luck.

there is no diary! but I can describe everything here!! the clones moved into the system about 3 weeks ago! at first we stood on the water for a couple of days, then I made 0.6 (EC) a week later I raised (EC) to 0.8 and then a week later I raised (EC) to 1.0 pH was always at 6.0-6.3

EC is to high drop it down to .5 or less. Your plans should be 3x the size for an ec of 1

Looks like Nutrient deficiency from nutrient lockout

With no diary, it's hard to tell you exactly what is going on here but to me, she looks terribly hungry.... Start a diary so we have as much information as we can get - we'll then be in a position to help you better! Good luck!

( Check and adjust your ph at least once a day ) -yes

Check and adjust your ph at least once a day

photos day 1 in water 400 ppm and keep your ph at 5.8 through veg. 2nd week if you see good growth up to 500 ppm 3rd week 600 ppm 4th 700 ppm 5th 800 ppm, stop there unless you really see they need more. autos start from day 1 at 200 ppm to 250 ppm and you increase every week the same way, but you stop at 600 to 650 ppm unless you see they really need more. When button size buds form then set your ph to 6.2 or 6.3