When I enlarge the pics, I see some spider webbing. Hopefully from an actual spider, not spider mites, but worth investigating.
Interesting discussion, night heat. Another one of those often overlooked variables when comparing growing in steamy SE US vs. desert/western US. I think dew, or lack thereof, is probably another. This is my primary complaint about buying unlabeled plants, I can't investigate their natural habitat.... to see how little it is likely to appreciate the accommodations I can offer. LOL! If it's really cute & not too expensive, I'll give it a try usually. : + )