Come on, all these pics show easy cheesy sorts of red plants.
Tell ya what, produce reds like these:
Since it is so easy and all............
Looks better to me. I've never found Rotala's to be particularly difficult plants. Weedy.......but not hard.
A wide range of red plants, a comparative sampling shows there's little evidence for support. Even if you find for yourself a case where you THINK it's due to lower NO3.........all it takes is for one person to prove you wrong. But it does not imply that you are correct, only that there is some correlation.
To test this hypothesis, that low NO3 = better color, we need to show that for ALL CASES, that this is true, which it clearly is not.
You might keep suggesting that the newest stem plant of the month requires low NHO3 for nice reds..........but that was done with all the species I posted above and those too...came to past and have been falsified.
New fish, shrimp, plants........because they are "new", have not had as much chance to be grown out by many folks and not enough time to test various situations and falsify, so ignorance and myth previals till such time that the myths are falsified. This has come to past for all the other plants, I see little rational logic to see why this does not extent to most all plants, but no one has falsified this statement yet