Bulbophyllum phalaenopsis is the biggest species in the Bulbophyllum genus. The name of 'phalaenopsis' is given from its leave size. This species is native to Papua New Guinea. The enlargement of its pseudobulb and leave size are the important indicators for your growing behaviour to this species. To me, the flower is a bonus but the healthy grow with the looooonnnnnnnnnnggggggggggggggg leave is a must. :)
I'm using seaweed based fertilizer (my own recipe) as a foliar spray and also applied composed soy bean as a slow release fertilizer. This bulbo is a heavy feeder, you need to apply more frequent fertilizer ( to me: twice a week ). The sphagnum moss with a little charcoal is the best media for this rare species since its need more water compare with the others bulbophyllum.
Hope will help you, especially the beginner.