Yellow leaves (wilma drip clay pebbles)

Junglist75

New Member
Hi I'm completely new to hydro so help please.

I have a Wilma 8 pot system but im running it with 4 pots, i am 3 weeks in on autoflowers fast eddie, quick one and fast jack from royal seeds, i have 2 x ISH150-type R Invisible sun quantum led boards running 18-6 light cycle, i am using advanced nutrients 3 part grow,micro and bloom with a bit of voodoo, b52, bud candy etc at the appropriate times. i have my water in my sump at 24c and the nutrients at the moment are bloom and b52 at EC between 1200 and 1600 ph is 5.5 then as it rises to 6.5 i ph down it back to 5.5 and so on. I completely drain the sump every 2 weeks and water every 2 hours for 15 mins with lights on and once for 15 half way through lights out and my lights are about 12 inches above the plants bearing in mind its led and give off nearly no heat. But my new growth all seems to be yellow in the veins as per photos... WHY? some one help please.
 

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Sorry I don't know much about hydro but from what I've heard, the water temp wants to be more like 21C max. and the pH should only drift between 5.5 and 6.2. Your EC sounds kind of high too for such young autos, but I dunno maybe I'm way off I just thought I'd offer something as I noticed nobody else has yet.
 
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