yellow leaves
I think maybe your plants aren't getting enough light to actually dry the medium before you water again. I have over 50 phals and keep them right in east and west windows. I've been doing that for over 10 years with good success and constant blooming. If you have to have them away from the direct light, get some cfl bulbs, those curly ones they sell at Home Depot and put them in a desk lamp aimed at the plant. As far as roots growing out of the medium, all my phals do that, some have roots coming out of every hole in my pots, I use the same type of pot you have in your pictures.
Hope this helps.
Cathy
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