Way to go! Never sphagnum (notta) with Phals! Need lottsa air, truley! You actually can grow these things in pots of marbles if you care to. The medium serves to anchor the plant. They don't tolerate dry roots, but what is worse is constantly wet roots. Given the correct blend, these things are weeds as house plants. If you are like I was starting out when I was in my "water everything heavy" stage, opt for the pot of marbles. I'm serious here. Hope it all works out for you. If not, it won't be cause you didn't try.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)