Thanks everyone! I haven't had this plant too long. I got it at the Ft Lauderdale OS Auction last October. I only paid $26 for it! Not too many people seemed to want it (lucky for me). The grower was Adamson's Orchids in Cocoa, Florida.
I have a small one of these as well - it came potted in very large bark, but doesn't seem to be thriving - the only really healthy and happy ones I've seem are mounted.
Anyone have success with the aggregatum in bark or other medium? Seems like it really likes to be mounted.