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

Hola coinsido con los compañero. Subiria el ph a 6.5 y agregaria un poco de cal mag a tu dieta. Despues comentanos como te fue suerte

ama i nutrimenti questa pianta😁 ...ok ho visto quale è e confermo...si piccola carenza di calcio ..risolvi con il cal mag ...probabilmente è colpa dell'illuminazione i nuovi led ogni tanto causano questa carenza

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