It’s been too long. I’d like to see Mr. T and the nursery again.

You can use the regular formula of Grow Dots outdoors as the auto will not have an extended veg. If you were growing photoperiod plants then I’d suggest the extended formula. With an autoflower, any pot over 10 gallons is super overkill. They only have a month of veg.

You can use microbes and enzyme products together without issue. Microbes also make enzymes.

As long as the stem is green and not woody, then roots can easily form. You can speed up the process by scraping off some of the outer cell layer and add a little rooting hormone on wound for roots to form from.

I try to advise against using carbon based sources for raising or lowering pH. In small amounts baking soda and acetic acid are fine. But I would never recommend using carbon based additives for pH on a large scale in reservoirs. Carbon creates solids and sludge.