Urgent! Upper leaves problem! Need help! DWC

[kakolukia1]

hi all. this is auto cinderella jack 11 weeks old by dutch passion seeds. my setup is:

30 liter water reservoir (DWC HYDROPONIC)
2 air bublers
2000 watt led grow light (light similar to 1400 watt HPS)
740 cfm fan
lights are 24 hours on
i use Genera Hydroponics flora trio + hydroguard, tap water with 120 tds. PH is 5.8

plant is really big and bushy. 3 days ago i noticed that upper leaves are loosing color and have some dots.lower leaves not affected yet. i thought it was light burn since it started spreading from upper leaves and moved lights far away but it didint help. i checked for root rot but i couldnt notice any mold or change of color where affected leaves meet bud. there are 3 more weeks to go until harvest. please help identify problem...

 

[AngryBird]

First, take a deeeeep breath.... Relaaax....
How close to harvest are you?

 

[Virgin Ground]

Have you changed nutrient strength lately? It could be either immobile or too much K possibly. But I grow in soil. So not much help to you other than the chart.

 

[AngryBird]

Think he is with his ladies...

 

[CannaCola]

easiest way to combat this quickly. Take the slight monetary hit, dump the reservoir . give it a clean. mix up a new batch (maybe add 100 ish ppm of cal-mag, or if in a pinch. epsom salts) lower your overall ppm on this batch just a little.

then sit back... and breath.

this will take care of any strange imbalances, and give it a fresh start to the day with everything it needs.

it could be a few different things, but this would cover them all without wasting time on trying to figure out exactly what it is. If i see an issue, i dont screw around. dump, refill. lift the light slightly for a few days, back off on ppm a little and it all sorts out

hope all goes well!