Thanks for the tips guys. There must be something about the medium then. However I am growing my niveum in cocofiber, pebbles, perlite and barkchip mix. On hot days the mix tends to become quite dry, but never on the wet end, but the growth is slow. The ones that I experienced rotting are the ones I kept in burnt soil + peat moss mix, but the paph is concolor and barbatum. I guess I may have to play around with the moisture retention level once more.
Anyway, Happy 2009 to you guys!!!