Yeah, that's why the inadequate lighting theory is puzzling for a super shallow tank. ALTHOUGH I really do agree that the light PAR deficiency may have been real, depending on placement of the ludwigia, esp before I added the Stingray. The Fugeray LED does not spread light well, IMHO - if you're not right under it, it isn't that bright. During week 3 of this tank, the green algae on leaves is really coming on strong (which I know can be caused by other issues, but in the main I did suspect (before posting this thread) that it was because of strong, not weak, light + not thriving plants to compete=lots of algae). Btw I don't have any fish in the tank right now and am clearing out dead leaves as they fall off.
Another part of this mystery: except for my echinodorus swords and anubias, all of which came with roots (and weirdly my HC baby tears which are holding on), none of the other plants are doing all that well either. Including rotala, myrio, wisteria, crypts, dwarf hairgrass. Roots aren't growing. I attributed it to new tank shock, but after 3 weeks I'm thinking it must be more than that (and algae is not helping matters right now). The lighting can't be the issue for all these plants, can it?? I'll attach a few more pix soon.