Week 5 update. Bubba showing the spots still, noticed more purple stems also.ppm around 700 pH is a struggle once I get it to 5.8 it starts to drop about day 5 of a new res change. I’ve been changing water every Sunday. By Friday I have to add pH up. New res added ph up at 1.5 ml a gallon didn’t do that last two changes. See if that helps. Continue with h202 at 1.5 ml a gallon. Also adding enzymes komplete at about 1ml a litre. Some pics.