Northern Light auto (First Grow)

Update 20/8/21 Hello folks new week new adventures. Today my Digital PH/EC/PPM meter arrived and i've put it straight to use. Turns out my Tap water has a PH value of 8!! instead of 7 what I thought (using a analogue meter) for any starter never buy these analogue PH meters they are absolutely useless!! I have taken extreme measures and Flushed every plant till the Run off had an acceptable value of around 6.3 PH. I've PH'd my water to 6. PPM readings on the runoff were around 400 PPM. after the flush I gave the plants new nutrients 600 PPM What have I learned? at first i didn't really want to spend like 100 euro's for a good digital sensor. Boy that was a stupid choice and after all I still bought it! and happy too now I can actually see what I'm doing. Hope to see the plants turn around a little after some day's let's Pray🙌😇 Update 22/8/2021 After all the stress from last week I do think my actions of last friday are paying off. I can't find any new damaged leaves. the pots are still very heavy from the flushing that I've done. might take a couple more day's before they dry up. They are probably still in recovery mode, this much water (flushing) surely is a shock for them as well. what a journey :D Update 24/8/2021 Nothing much to say now. the pots are slowly drying up but they still feel heavy it's been 4 days now since I flushed them. out of 3 that were sick 2 of them are slowly starting to look better. or at least I see growth progress. but bear in mind that this is only week 3 of flowering so a lot can happen.🙏 update 25/8/2021 today the pots finally ran dry. filled them up again with PH 6.5 water till runoff (after I Measured runoff I was better off going for PH 6 water i guess) measured run off now is around 6.8 PH and 800 PPM. i reckon it will take some time to get on the right PH lvl. at least we are in a better range now than 1 week ago. so the flush did work but didn't completely get to the desired PH range.