James,
Can you explain the purpose of this tank? If it's a propogation tank, I would assume that hardscape would be nil, and you would focus on proper lighting, CO2, and fertilization. Is this tank designed to be a grow-out tank for new plants you want to try, before you add them to your "show tanks" ?
Regarding your substrate: will you have a finer substrate on the sides, with that pebble/large gravel river in the middle?
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