Interveinal chlorosis on older and new leaves. Magnesium deficiency?

Thanks for the replies! My pH meter is calibrated well and I don't let my nutrient mix to sit for long. Ive been supplementing 0.5ml/L of Biobizz cal mag as I'm using filtered water. But looks like I gotta raise it up higher and perhaps increase the pH to 6.5 to help with the mag absorption.

If it’s soil, I’d be worried that my PH pen or device might be off a bit.. Cuz once it dips below 6.0 the magnesium uptake gets low on soil. I’d be tempted to run closer to 6.5-6.8 and maybe add some Epsom salts to the feed. I use a pinch per liter or so.. upping calmag may work as well but I’d look for a pure source of mag. Good luck amigo!