Autoflower NEED ADVICE PLEASE

autoflower green poison at about 3 weeks just started flowering.
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Temp lights on 72-77
lights off 68-70
Rh: 35-60
ph 5.7-6.1

started wit tap water of 240 ppm added nutes to make solution about 600 ppm. I started noticing tips just a bit ellow and some ellowing between veins so i changed from tap water to ro water and got solution to 500ppm leaves started getting rust spotting near tips also with yellowing between veins eventually spreading to whole leaf. Tats wen i lowered solution furter and added cal mag and also made a foliar spra of cl mag and epsom salt sowing no cange after treatment. this started from the older lower fan leaves. leaves eventually turn all spots of brown dark green yellow and crisp curl and start to cup inwards. I first thought it was nutrient burn then figured may be a deficiency of magnesium and calcium. after now going back to tap water off 240ppm for 48hours toda added nutes just to 320 ppm total p of 5.8-6.0. Could it be a fungus of some kind of maybe this plant is very sensitive to nutrients and being over fed causing lockout and deficiency. an help would be greatly appreciated please post picture if out ave ad similar looking problems. te yellowing between veins of new growth iv only noticed since flushing wit straight tap water. since problem started i noticed slow vertical growth as well as slow root development.

Has sort of an over watered look which is an oxygen problem in hydro. So check your rez temps because if they get too high they won't hold oxygen. Or maybe inadequate bubblers? I would go with the ro water and a cal/mag add back as the cal/mag in tap water isn't always easy for the plant to take in.

trash it and start over

res temps are between 72-74 i dont think temp is the problem. seems to be aerated enough but i will keep that in mind maybe get a new pump and air stone. thanks for the help.

Its not about DO but bubbles flowing up thru roots, air stones plug up. Use beefy pumps.

kinda looks like a K def to me
would explain the slow development

multiple problems, lack of oxygen/lockout/burn

add another pump, lower ec and wait.. how fast did you bump to 600ppm? 600 is alot for an auto in dwc especially if the strain isn't tolerant to high ppm. I think you added too much to quick it shocked and locked out causing it to reject certain nutes like k and calcium now all your doing is starving and burning her you need to reverse the damage. Salvage whatever possible with a photo period strain you would be ok fix the problem wait 2-3 weeks and it would come around.. with a auto which has a time limit your looking at a seriou loss in yield and density of bud. Im guessing 5 - 7 gram harvest now.

lastly i think you may have made your foliar spray to concentrated and toasted your fan leaves..

KBKiller? Kind Bud Killer? You sure did just that to your plant that's for sure. Your girl looks pretty bad. The advice youngbuzz101 is giving you sounds pretty solid. I ran DWC in the past and what he has stated above sounds about right.

Thank u everyone for your advice. The foliar spray was a last resort and I used 1/2 strength of what was recommended I noticed very little improvement but it did not hurt the plant. I think I had nutes too high causing lockout and also I think my pump was getting old just added a new pump and within 24 hours she has perked up and showing root and vertical growth again. I've never grown auto flower I didn't realize how sensitive they may be to over feeding.

So since backing down the nutes to 320 ppm a couple days ago and adding new pump yesterday has definitely shown a lot of improvement. She is now drinking a noticeable amount and the ppm is getting lower now that she is feeding. I will raise nutrients to 400 in a few days if growth continues.