Is there a particular genus that this is affecting? Or is it happening on more than one? I know that in the past, one of my phrag besseae's had the edges of the leaves turn somewhat of a more yellow color, but then I increased humidity/water and decreased the light intensity slightly, and it seemed to help a little bit- I wonder if it's due to humidity/water loss on finer leaves partially due to too much air movement.
Can you post some pictures?
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