I am glad you are finding help. If I have no experience with something I just cannot offer advice. The yellow halos usually indicate fungal infection. It infects through spores which can travel by water or air and prefer damp conditions. Isopropyl alcohol dries and kills the spores (but you should never get the alcohol on the roots--it dries them, too).
My Phal bellina leaves now have a bunch of yellow spots as water dripped from one of my mounts and I didn't notice right away. With the cooler temperatures, spots. I did catch the fungus with the alcohol so it did not get worse but the upper leaves aren't the prettiest. With Phals' slow growth, it will be a few years before it looks presentable.
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