Sounds like you already have it pretty good. Just monitor the guppies. Although I hate to contradict with the veterans here, I wouldn't reccomend salt with kuhli's unless you MUST HAVE TO, as iv'e been told they can't really handle salty water. @Guppysnail @lefty o please correct me if I'm wrong about the loaches. this is only from what an old friend who kept them told me.
Keep us updated on these guppies! I'd love to hear more about them soon! Also, I forgot to mention, if they do in fact breed (They probably will) separate the babies from the parents, my sister also kept them and we went from 11-ish fry and only 2 made it to adulthood.