Fe EDTA needs a pH below 6.5 to maintain its bond for any worth while amount of time if I'm not mistaken. I did some reading on the subject a while back. Try Fe DPTA.
Other than that, the green/red thing is nutrient based as much as anything. I'm trying to stop all my plants from turning green as well; nitrate and phosphate limitation would be the latest effort to turn them back red.
So explain this since neither the sediment nor water column is anywhere close to limiting for N or P:
NO3 added: 40 ppm a week as KNO3, over 15ppm added of PO4.
ADA AS(very rich in N and P).
If that is honestly true, then why is my plant growing so well, very fast(4-6" weekly), I have huge group, repeated it several times(see pic below from a few years before- same sediment and dosing routine), I have excellent color???????
How could it be that? If what you say is true or holds any water?
I've done it several times now, it's not just due to "luck".
Here's a pic after the CO2 was a bit off, the leaves formed became weird, and wider, sometimes it's stunted if I did not clean the Disc.
I used a mazzei on this tank and the CO2 was very stable, when I changes to disc, it took a long time to correct the CO2. Nutrient dosing, light and sediment where unchanged and that is very easy to verify.
But that's all that was left.
So I cleaned and tweaked the disc, then the plant started growing like mad once again. I did not like the disc, so went to needle wheel. Took much less time to adjust the plant, t went through some weird wide leaves and stunted tips, but color was really not affected much.
Then the new growth took off after some patience.