Paul, all of your den's are beautiful! I like all the pointed petals, all of mine are so roundish.
Jacques, I'm not Ursula, but if I may.....I grow a number of bulbo's and they are all in the same orchid mix I use for everything else, but I mix in a little big of sphagnum moss too. I have them in regular wood slatted baskets, and in terra cotta orchid pots, and a few are even mounted on wood with a bunch of sphagnum under them. When it's hot I usually water them once every day or two with the hose when I'm doing my vandas. I've been told they need a LOT of water, but I don't feel they need much more than most of my other orchids, and certainly less than my vandas.