also on a side note
it is my opinion that fox farms happy frog and ocean forest both benefit from adding perlite and sand to help with drainage. personally i think that their products are overpriced when you consider how much more soil you get when you mix up your own.
if you do have some fox farm lying around that has the mycrorizae added to it you can use a small amount of that soil to inncoulate home made mixes with the beneficial fungus