Sorry to hear about the crispy Pleuros! They are so intolerant of adverse conditions.
I've taken the mini plunge and have a terrarium with a bunch of little guys. I'm not sure what I was thinking, but they are cute. A couple are about to bloom, and my driftwood is getting moldy in the humidity. Will regular Physan sprays counteract the mold? Or is 80-90% humidity too moist? I just love running the little fogger!