Also be aware that you will need to periodically trim back your stems as they will grow very fast once conditions are met and need thinning out so they don't choke out your other plants and don't get too leggy or die back at the bottom.
Myriophyllum will fill your tank in no time. Mine doubled in size in only a few days and in my old sorority I used to let it spread across the surface of the tank so the less aggressives females could hide out in it.
It does take a few days to bounce back from trimming, but after the top part of the stem dies off it will send up a new node.
I'd personally use water sprite, myriophyllum and possibly the rotala as the 'canopy' of your sorority. Then beneath these, use anubias and java fern as they do best in shaded light.
None of these plants are really root feeders at all, but you will get some impressive root systems on the stems if you supplement the substrate.