I have been trying two methods to grow Phrags. myself. One is working well, the other not so much.
I have been treating them as two different groups of orchids. All of my smaller ones I have shifted back to pure Sphagnum moss. I grow these all under lights indoors. Outside here in SE Michigan, I can not keep them wet enough. I water these besseae, dalesandroii, schlimii things quite often, every three days. They sit in a little water but still dry rapidly. Sphagnum is tricky to use, too dense or hard packed blocks water absorption. too loose dries out very quickly. My humidity is up to around 50-60% in the winter, 70-80% during the summer. Winter days are about 10 hours under lights, 12 during the summer. I have fans blowing lightly all year round.
My larger types like Don Wimber, Inca Embers, Sorcerer's Apprentice are in a mix that I call my "oreo" mix. I put a layer of fine bark, perlite and charcoal in the bottom. Then I use a layer of sphagnum moss then top dress with more seedling bark mix. After three years of growing like this, those plants look good. They are growing well, are regular bloomers but I still water them every 4-5 days inside and out. These bigger types go outside by May 15th and come in around October 1st.
Kovachii likes to be in a seedling mix too but need more water then Don Wimber types in my limited experience. They are not easy to grow. Even it's hybrids need more attention. Kovachii likes it a bit cooler too.
But you will get more responses here and probably get as many methods as responses. It seems like every one does something a little different. Good luck.
Bill
