GREENHOUSE FEEDING IN COCO? 6.3 TOO HIGH? TOO LOW?

Hey guys so would you suggest I just keep feeding calmag every other watering or every watering? Also I watered today with no calmag 5.9-6 and they kinda look better...? I'm not really sure, but tomorrow I'll had calmag to the water to raise it to 250 ppm and ph it to 5.9, see how it reacts

I think the pH is ok, but ideally you want it to go up and down with feed as the uptake of different minerals and stuff occurs at different pH levels. I found a neat article here that gives you a bunch of natural ways to alter the pH of your water, including lemon juice and milk, etc. https://autoflowerseedshop.com/cannabis-ph-chart-guide/ Because you have a few plants on the go, you can try isolating the problem by feeding them all slightly differently?

6.3 may be a touch high for coco. They look good though—- thinking the pale looking leaves is your light/photos. I try and get close to 5.9-6 for coco.

11l pots water declorinate dwith air pump for 24 hours, to which I had cal mag BioBizz water goes in at 284ppm with (calibrated with Hanna 1413) I was doing it every watering for a few days but started every other watering, tap water is around 90ppm

So in more detail I ve had a few problems with fungus gnats,applied bioneem and seems to have slowed it down, but the deficiencies started at 3 weeks veg (mg I suppose) on one of the plants and eventually spread to the rest of em, I'm thinking a ph issue? I'm running a marshydro fc4800 at 50%, 60-65 cm away from cannopy temperature is between 24-26° C and humidity is between 45-55%