Hmm I like the micro paludarium idea!!! I think that having a salt water tank might be a bit Ironic to have next to a Freshwater planted tank. But that depends on how much you like Saltwater. If you go the micro paludarium route you can make it so they fit harmoniously together. From the forest to underwater. Then to the sea (if you have a stand that could hold 3 mini M's that is!