I would make a tank so deep i could swim in it to plant my plants. It would have a current that went front to back so it would be like a river. A little far fetched but its a fantasty. Plants would be Cyperus Helfari and Polygonum (Red). Look it the aquarium plant handbook and find the picture of the river that is the look i would want. Its got Polygonum growing from grassy plants.