i would definatly go rainforest. if you utilize the height and stay away from paludarium a nice group of P. klemmeri would be really cool. if you do the deep water and take away the height i would go with some PDFs. the leucs Marty mentioned stand out great in planted vivs and are really bold.
with a tank that size i would try and do some seperate water areas. maybe some deeper than others with little streams connecting them. you could almost do like a marsh or riverbank type tank and have the water flow from one end to the other. it may make a cool flow through the streams with some creative diversions.
something else to consider would be elevated pools that then fall into lower ones before emptying into your main water body. this always gives a real naturan effect IMO. good luck and defiantly keep us posted as to what you decide.
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