The tank she's in has an adjustable filter flow. I just have it down to minimal and assume that it will be okay as I don't have a high bioload in her tank. In Sammie's tank, well, there's all sorts of jerryrigged stuff going on to kill the current because he just gets in a foul mood if he has to deal with any movement.
I had 6 white clouds. 5 are doing great. One of the males just hung out by himself, wouldn't eat, etc. I finally pulled him from the tank, put him in QT, and when I finally realized how skinny he was (despite feedings) compaired to the others, I euthanized him. He wasn't swimming around or anything even in QT. I don't know what was wrong with him except maybe that he just was not happy and gave up. The other white clouds go on with their lives, swim about, get fat with eggs, and have no compunction about trying to make off with a betta ball or two if Sammie's not paying close attention to his food (he gets a few balls, then they all get flakes).
Online stuff says that white clouds are fine in pretty much anything from cold water up to the bottom half of the tropical range. However, as it is summer here in Texas and there is no place in my apartment that ever gets below about 80, they are just going to have to deal. I don't see any behaviour from them indicating that they are not tolerating the temperature. The dude at my LFS states that they always keep bettas and white clouds together as they are from the same region. I'm not stating that I fully trust anyone at a LFS, but this dude's pretty okay.