Noid Phal. silver on leaf

[LoveOscar]

I bought a new mini noid Phal. yesterday, and all seemed fine after a light perusal of the plant. Today, however, after a more thorough once over, I found something I am less than confident with in a new plant. There is some white/silver coloring on a small, lower leaf. It seems to be, so far, affecting only one leaf. It's a bit tight to reach so I don't know if it is powdery or not. What is it? How do I treat it? This little guy has 4 spikes on it, 2 flowering, 1 starting to bud and as you can probably tell, potted in sphag moss, and in a small ceramic pot from the store. I don't know how much I can do it while it's flowering.

All advice is appreciated. I tried going through the AOS links in the sticky, but I couldn't find anything like it.

LO

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