So of us dose nitrate, cuz yes its hard to maintain nitrate in a densely planted tank. If you do a heavy fertilizer regime 50% weekly water changes are kinda required. Then I bump nitrate up to 20ppm after ever water change. And thats just one of 5 fertilizers.
I know quite a few ppl do water changes without dechlor, but depends on your tap water and the size of the water change. At my old apartment I wouldn't worry if I forgot dechlor since it was chlorinated weakly, my new place has chloramines and they are pretty heavy.