I am not a phal person in my collection, I will admit I do have a few that are left over from more then 8 years ago, living in Florida I mounted all of mine upside down so that there was no chance of water staying in the crown of the plant. Ray has given you all the information you need as he knows his stuff! I would only say one thing water more then what you are doing, when watering the roots they are going to change to a dark green in color when you see the first signs of that color changing to another color then dark green then water again. I will let Ray answer the rest of your questions.