I don't really know very well but I think most gymnos do best with a cooler winter.
I am not thinking about this so seriously. I have several displays already that I am trying to whip into shape--a 50, a 65 and a 56--but I also have a bit more room. It really would be cool to get a tan kof those fish going.
I have a hard time thinking of something new to do with riparium plants for a setup like this. My earlier idea of Cyperus + emersed stems might be a good one and I could make an effort to try some stems that I have haven't used before.