Yes I doubt it would be a danio. I happened to stumble across this while searching the web:
An opposite problem seems to occur in aquariums where waters remain particularly warm. These warm temperatures speed up the metabolisms of the Ghost Shrimp, making them more active. Unfortunately, along with this increased activity, some people have reported an increased aggressiveness. It has been observed that Ghost Shrimp may attack fish at higher temperatures.
http://www.centralpets.com/animals/f...s/fwi4997.html
So I guess maybe it could be the Ghost Shrimp. But I still think it is the RTS, they and Bettas are not exactly compatible...