ok, i'm not gonna lie I didn't bother to read the whole 5 pages, but i thought i'd add on with some experience of my own with planted tanks and removing nitrate. I'm not proud of the fact that i've neglected my tank so much, but i have a ten gallon that I havn't done a water change in since about may. I have one dwarf puffer and half of the tank is packed with water wisteria, and a few java fern plants. I havn't detected any nitrates in the water from my api water test still. I have no detectible nitrites, or ammonia as well. I'm about to convert the tank to a planted one, so I will be adding nitrates to the tank in a few weeks, however I think plants have a very practical use in aquariums if you get the right number of plants to fish.