Greetings, if you are referring to the pH swinging, that is s a combination of bio activity, D-Oxygen, buffer agents. It will swing daily and most times it down. You just need to learn what your setup does, you can control pH swing's with air bubbles.
Mine swings up but I still check daily when running a res, if I want a strict range. If not I let it swing between 5.8-6.2.
Furthermore ca:mg is the most common def in Cannabis growing in water and Coco.
Coco has issues with P loading as well. Hydro doesn't. Hydroguard is your friend too.
Also r/h in veg can be 70's with out issue as long as air movement and ventilation is adequate. In flower is when you want 45-53%
#Random