Help

something with Ca/Mg it locks out K and the one of em adjust ppm ratio Ca/Mg around 140/70 check out ppm ur water

Like I said before on one of your other questions...looks like root rot symptoms to me. 21c is a bit hot for hydro...17c-19c would be a sweet spot.

Seven years... you'll get there, maybe.

Hey 👋 Your EC is very low. I would suggest to raise to 6.2-6.5. The yellowing leaves are from my point of view a nitrogen deficiency. Give her some grow fertilizer. Hope she will get well soon.