Hi I have not been there for a while for the holidays and on my return I find a surprise the monster zkittlez has started to bloom and surprise it is an almost black purple and apart from some yellow leaves and spectacular to see
Hi there!
Don't worry about the yellowing leaves. I guess You have given her everything she needed, I see you even regulated the PH. It's autumn, it's totally normal.
All resources go into the flowers, that's how she's getting prepared for the end of her lifecycle.
Good luck!