how's the plant going?
have you been able to turn the plants back to red?
I am really curious about the conclusions of this wonderful discussion.
I have heard about limiting NO3 and PO4 may make the plants get redder.
On some terrestrial plants, higher light may induce some hormones that turns the leaf into red, is this applicable to aquatic plants as well? some folks say so...
My experience is by limiting NO3 may increase the variegated color of my anubias, but doesn't guarantee the red coloration (which can be caused by many other parameters for sure).
For certain, having lush and healthy plants (showing their real color) is one's great joy.
Cheerio
Hans