I keep my two mounted on cork with just a little sphag. here and there to hold a little moisture when I spray it. I keep mine hanging lower to the ground in an East sliding glass window to maximize the morning exposure. I supplement part of the year with CFL's (red/blue mix, heavy on the red). It gets diluted fertilizer once a weeks - a 5 minute soak. And I spray it roughly 4-5 days a week. Water quality is very important. Try rain, lake/spring, or reverse osmosis water. The old roots do die off regularly on mine, but it's as healthy as a horse.... (you can see a photo of it in genus specific photography section from a few weeks ago.)
Hope this helps.

Matt E.