I told ya that from the get go, and about a ph and ec pen, ya got thevph pen, a ec pen is different unless you got a combo pen which I strongly suggest you don't get. If your going to continue to grow with salts they are essentia
Do you have ph down or phosphoric acid.?
6.5 is high for salts and your substrate! 6.2 max , shoot for 6.0 ph , but switching it up and keeping it between 5.8 to 6.2 is crucial. Different nutrients have different availability to plants based on pH levels. I recommend doing research and knowing the basics , before your next grow, but nothing wrong with hands on mistakes, that's how I learned, but we didn't have the Internet when I started growing.
