
You are right, I should share what led me to this idea and what I have been reading.
I was put under the impression that the potting soil would be good for its organic components from advice on another bonsai forum last year. I know, take advice for what its worth.
Now the info that is making me regret my soil decision is from
The Bonsai Workshop by Herb Gustafson pp. 91-93 where he talks about particle size, texture and soil composition.