Yes, nitrates are being produced by the bacteria. I'm very familiar with the nitrogen cycle and have been keeping tanks for a long time; though I've never done a planted tank before. So my question related to EI dosing and whether my plants would be adversely affected by daily water changes.
I do dose nitrates, but only when they drop. Dosing ammonia causes nitrates to rise, though the plants do eventually consume it and so I add nitrate when it tests below 10ppm or so; (With no livestock, I'm less concerned about high nitrate levels. And they never get 'that' high).
I was under the impression that plants would consume nitrogen in any form it presents itself, but they don't seem the least bit interested in the nitrite. It remains at 1-3~as high as 4ish ppm, and doesn't seem to drop until a water change, then it quickly climbs again with an ammonia dose.