Brown fuzz destroying phal leaves

[WaterWitchin]

Mites is also what I was thinking, but I've only seen them on my catasetum once, and don't know much about them other than they're nasty little buggers. But I was hesitant to say that, as I thought they mostly preyed on thinner leaved plants. Phals?

---------- Post added at 07:53 AM ---------- Previous post was at 07:41 AM ----------

I googled "red spider mites on phal leaves," and resulting pictures sure looks like the leaves on Arringar's plant. And evidently they can be common on phals. As I said, only seen them once here. Mites aren't a common pest here, but probably because I keep humidity fairly high and have fans.