To find out my coco ph I water until I get runoff and ph the runoff. Soil is different than coco, but for coco I need 5.5-6.5 ph. My nute mix is 6.3-6.4ish, and my runoff is 5.5-5.7ish, so thats perfect, and I don't even need to adjust my nutes ph :bigjoint:
For soil I believe you want a higher...