Hello, Dave. Dr. Yin-Tung Wang is a Texas A&M floriculturist at the Weslaco Center and is a consultant to the orchid industry. I have found the following series of articles on phalaenopsis culture to be quite interesting and very helpful. I believe you will find some answers to your questions here. Joe
https://sharepoint.agriculture.purdu...20Part%201.pdf
https://sharepoint.agriculture.purdu...20Part%202.pdf
https://sharepoint.agriculture.purdu...20Part%203.pdf
http://www.staugorchidsociety.org/up...sis_Part_4.pdf