Dan,
Pro-Mix contains trace amounts of Lime - nowhere near enough for the EarthTainer ecosystem.
I am going to use Orchid Bark this Season to see how it works. More expensive than the Earth-grow pine bark at Home Depot - but I believe it will perform better. I'll know more at the end of the Season, but it is something you may want to consider.
Adding other mycos is always a good idea. I've had good success with Actinovate, Biota-Max, and Azos.
Raybo
