DrCALIGREENTHUM
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ya, those ppms are just a we bit high,you probbly should have them around 400.i would start a a flush asap with phed water, there not bad yet but things could get ALOT worse the longer you wait. idk about the yellow one,it looked gone to me.
Well I don't do hydro anymore and this is a good example why I stopped. First off in your pics I see alge growing in there. 5.9 is a little high. Those rez temps could be lower to. They are defenietly locked out and probably cooking to even at 2 feet away in that unhealthy of a state. The snowball effect. One problem exsaserbates another. That alge will rob the root zone of o2 and choke out your roots I believe. I am no expert like I said in hydro but you do have multiple problems from what I can see. I will say have you concidered organic growing. Easier much more forgiving and alot less problems. Or even soilless would be better in my opinon. you could still hydro feed. I only use rockwool for cloning and then I throw them in soil. Perfect crops everytime. Full hydro to many things to go wrong and quickly. You want to salvage them dump your rez clean it real good flush those girls real good and raise the light up way up till they get healthier. 5.5 on ph 62 degree rez temp and get something to kill that alge. Back the nutes down to maybe half of what they are now. I would also add that if you are using a digital balast grab yourself a MH bulb and use that till you are ready to flower. The hps in my opinon should only be used for flowering. MH will make them get nice and bushy hps will make them stretch and give you fat buds.
What's going on with ur plants is ph lockout. Drop ur ph down to 5.5-5.6 when u feed.. that way it drifts up to 5.8 or so before they get fed again. In hydro tons of elements are locked out at 6.0 ph.. ur plants are nutrient stressed and light stressed. Back that light off until they are better.. should be back in action in a week or so if u fix the ph problem. Good luck
Empire is spot on with ph. Did you soak/flush your cubes with ph adjusted water?
Edit: Also, usually the algae isn't a problem. The plant will ge big enough, block light to the cube, and the algae will die. You could always spray the cubes only with phsyan 20 (only if in veg!)
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