Brown spots

that's a lock out dude as its going top-down water with plain ph 6.3 water until 20% run-off

Your stop on.. Cal her. So give a good feeding. Let it dry out. Bring your ambient tap water up to 250-350ppm (depending on your calmag) and your ambient tap ppm. Water. So if your water is 150 add 100-150 of cal and this will push the plant to only fixing her czl issue. And then get back to feeding reg and each week during your water feeds in between fert feeds you can do a cal/mag feed. Good luck

Hi, I agree with the others. I would raise the pH to 6.5 and add a bit of cal mag to your diet. Then let us know how it went, good luck!

but the nutrients for this plant😁 ...ok I saw which one it is and I confirm...yes, small calcium deficiency..solve it with cal mag...probably it's the lighting's fault, the new LEDs sometimes cause this deficiency

I had a similar issue on first run, calmag solved for me. Hard to say if its the "same problem"