Another fish for the upper part of the tank: The African Butterfly fish –
Pantodon buchholzi (Could be fun to have butterflies in the marine tank, the fresh water tank and of course in the butterfly garden...) You cant really see it in the picture I've enclosed, but this guy has some huge pectoral fins and (although smaller) it's a jumper in the same class as the Arrowana!
Link to a page with a bit more info on the Butterfly:
http://www.exotictropicals.com/encyc.../butterfly.htm
and they also have one about the Arrowana:
http://www.exotictropicals.com/encyc...us/arowana.htm