WOW that tank viewable from all sides sounds amazing and haha ye first water then a lot of sand and river pebbles, maybe a few huge smooth rocks and things fine tree like branches and twigs and some large reed like plants in the line of a few huge wave makers with some vroken up bark and a few leaves scatgtered all over the sand, and some java mass on the wood. Get a nice set of bulbs for light to give a natural clean light with maybe a slightly blue/pink glow to it. lIke origional tropical bulbs if your wondering what i mean by a slightly pink glow.
Then get a decent sized shoal of many types of peacock bass a couple blue/black or silver aros. A group of florida/spotted gar, a couple of fly river turtles a large oxydoras niger, a large adonis plec Then a shoal of XXL scatter fish like flag fin prochilodus or silver sharks, tinfoils, masheer, lemon fins, hampalas. Get 3 or 4 large fire eels a clown knife and maybe a datnioides pulcher oh and possibly p14's or marble motoros. Just quickly im sure i could think of even better fish.
Sound good?