I use promix, but I keep my ph at about 6.3.

I treated it as though it were soil. My plants have all done great in promix for the 2-3 weeks.

When they're initially seedlings in rapid rooters is the only time I'll water with water ph'd below 6.0. I use 5.8 to be exact. Something I read about the slightly more acidic range being great for root development early on.
daihashi Reviewed by daihashi on . Need help with nutrient lockout Hope somebody can clear this up for me. I am almost 100% that I have nutrient lockout and that it is being caused by a ph problem. Sorry I don't have any pics to show, but from what I've seen and read, I am sure it is a nutrient lockout. I have 8 plants. 3 of them have burnt tips and edges and turning yellow. 2 of them show an Iron deficiency, and the other 3 look very healthy. The medium I am using is Promix. I water with regular tap water, the ph on the tap water is 7.2 to 7.3. This Rating: 5