New deficiency in dwc

This will be my first plant in dwc it is about 3 or 4 days into flower just started noticing this happening to the leaves. I’m using jacks hydro 321 formula under a hlg 600h light I’m thinking it’s probably a ph fluctuation problem so I added some down what do you guys think?

So you arbitrarily added pH down?....what pH are you running?

I added it til it settled at around 5.9-6 I think it was at 6.8 maybe

Give it time if you just made pH corrections. Good luck.

It was just oh I believe no new damage.