I grew Hoya deykeae in my regular mix, but it seemed really susceptible to over-watering. It does not grow nearly as easily as H. callistophylla, but is less difficult than Hoya sp. gunung gading. It can turn on a dime; one day it will look like it is thriving and the next can look like its on death’s doorstep. A wrong watering move will make several leaves turn yellow, look jaundiced and eventually fall off.