I have four regular White Clouds, which were actually bought for a cold-water tank, but were much too greedy little eaters and would have starved out my Central Mud Minnow, who was dug out of a drying ditch, and whose tail is bent in two places just behind the body (although he gets around well) and a rather slow eater.
So, instead, they're in a 15 gal. with my betta and will be joined shortly by 4 Long-Finned White Clouds currently still in quarantine.
The compromise temp of about 77F seems to work well all around - they're all lively, colourful, active, and eat like little pigs - so while ideal circumstances may not be achievable for both, it doesn't appear to harm either type.
Temperatures do vary in the wild, so as long as they're well-fed and in good conditions, I'd think the numerous success stories suggest that the combination does work nicely.
The other fish, by the way, preceded the betta into the tank, (he was sold as a half-moon - and the temperment seems much better in such lines) which is a well-planted Walstad with plenty of cover.
There have been times when the tank has appeared to be empty, as everyone's dashing around in the bushes...
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