Not that I'd be able to locate. Pretty rare for someone to do it, but it is something I've seen over the years-- and not just the random guy on youtube who throws some African cichlids into a SW tank, but I've seen it done by a couple of people who put some thought and research into it.Thanks neutrino, I have been looking for this article. BTW the other people that you mentioned, is there any way that I can look into how they did it or see pictures?