First day of the 12/12. A new reservoir was prepared on the first day. The pH started at 5.53 (20.9°C).
After 2 hours of agitation and oxygenation, it settled at 5.68 (21.1°C), which is perfect for coco. So, I didn't make any adjustments.
I pruned and defoliated the plants at F4. They bounced back without any stress. They grow vigorously and they are beautiful.