RDWC problem

[medicalfarm]

Hi all, I'm having a problem in this RDWC cycle on some leaves.
The room is made up of three lines with Alien RDWC systems, each line is made up of 81 vessels controlled and monitored by the Nuravine system.
The pH of the solution is 5.9 stable with a tendency to rise slightly, EC of 1.5 with a tendency to fall, ORP 350-380 MV, I use Idrolab as fertilizers.
I tried to increase the component with Magnesium and calcium thinking of a deficiency of this element.
I am at 4 weeks and 2 days, Temperature 25.5 C° and 60% VPD 1.25 day, 22 C° 55% VPD 1.1 night.
CO2 1200 ppm
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[Creeperpark]

Hello friend. Since you are using a complete fertilizer it's probably not an EC issue. The only other option is a pH issue due to a swing in the pH. Perhaps there is a water issue from not having enough buffer in the water. What is your starting water?