Ok so i can't figure this out. Got a purple paralyzer going in my 5 gallon dwc and the older fan leaves keep getting spots. Little red spots then the leaf drys out and turns yellow. I can't figure this out. I have added recommended cal mag and the p.h. Is constantly 5.7/5.8 range and the temp is about 77-82ish at most. The new growth is fine. I was wondering what could be doing this. It's has just been this strain. Anyone ever grown it? What is the deal what should I do.