Growing Hoya linearis Part One

When I received the plant my first shock was the medium in which it was growing. She was growing the plant in what looked to me like bonsai soil. I emailed her to ask what it was, and she said that it was indeed bonsai soil made by a company called Bonsai Jack. She used it she said because she was too kind to her plants, which I interpreted as she watered frequently and this medium was insurance against root rot. Below a close-up of the mix: