I wonder then if you might try moving the masdevallias out of the tank and into your general collection? Sorry I can't be more help, the only other thing that comes to mind is that your plants might simply be growing too warm; most of the masdevallias out there are temperature tolerant, but they seem to prefer the low side of intermediate temps, actually favoring cool. I was hoping one of the others would chime in by now...have you tried checking with Ron to see if he has any cultural advice for you?
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