I have grown just about every orchid you can think of successfully, and would now like to try my hand at Disa's. South African growers swear by semi hydroponic culture with excellent water and fine riversand as a medium. Another grower in california recommended I use Aquatic Plant Media such as that made by Schultz. That seems to be logical to me but in this area, I am one serious novice! Can anyone give me some advice if this is a good idea, and if not, why?