I really like Kuhli loaches, if you do a search on google for them there are lots of tips, it seems to be hit or miss for finding a female. In my last tank I had like 20 of them, and while I saw eggs I didnt know what to do with them so just left them, an accident killed everything off befor they had a chance to hatch.
FYI the more you have the more active they are, its really neat seeing them in a big ball playing, or playing what looks like tag, lol.