Soil pH7 ok for seedlings?

Hi again Zoomer, glad to see you're back in business mate. This is a good question, I'm currently doing my first grow thats virtually the same as yours. White widow fems from crop king in promix ph. I've done extensive research on ph & Promix and gotten 50 different answers but the conclusion I came to was that around 6.1-6.3 is a sort of sweet spot for promix hp. In terms of how to ph the feed I took Kyle Kushman's advice on it which is If you feed at 6.1 ph and the runoff tests 5.8, next feed try 6.4 to raise it up and vise versa to bring it back to the proper range. The dolomite lime does buffer pretty well so it can be forgiving but that's the logic behind it anyway. Goodluck!

Pro mix HP is amazing stuff. Great for seedlings. Was using that for 8 years well nobody touched it. Now I moved on to sunshine mix #4 and it seems pro mix hp became a popular choice. Funny how that goes. I've planted thousands if seedlings in pro mix hp and I've never had a issue. Happy growing and stay lit fam.

The reading I got from my Promix HP Myco I tested was 6.5 not 7.. Promix HP with Myco is such a fantastic product as it's really light, airy and really great for growing Cannabis.

Absolutely fine. The pH matters with nutroent uptake, but seedlings are using the nutrients contained with the seed for the first week at least. So you don't have to worry about uptake during this phase. After 10 days or so, try to get it down to about 6.3.