Slightly unrelated but what is your light or its par?
I have the same plants in the back right and some rotala that is supposed to be red but only the top leaves turn red. Everything else is green.
I'm using two Finnex Planted 24/7 lights, with one running in 24/7 mode and the other at full brightness from 11am to 5pm. Should be plenty of light. However, the Stargrass in front are really filling in and are blocking light to the lower part of the plants, so that could be why. LEDs aren't very good at spreading out light, so I feel like I'd have better luck with a fluorescent light.
BTW, supplementing with Flourish Iron is having a positive effect on the Mayaca Fluviatilis. The new growth is now a light green, not white. Once it is all depleted, I'll be buying some dry Fe and mixing it in with my IE dosage.
Apparently UV light degrades Fe-EDTA and Fe-DTPA, which would explain why I need to boost my Fe levels. Anyone have knowledge of this?
Also just read this:
"Iron ethylendiaminetetraacetic acid (EDTA): Although Fe-EDTA has been the most commonly used chelating agent, it is a slightly toxic form of chelated iron to plants and may thus present challenges in aquaponic systems (Rakocy et al., 2006;Vadas et al., 2007;Ghasemi et al., 2014). It has the ability to form complexes with free metal cations (such as Zn, Cu, and Mn), thereby decreasing their avail- ability for plant uptake(Albano and Miller, 2001;Vadas et al., 2007). "