Originally Posted by BruceF
Rotala macrandra requires generous amounts of light, carbon dioxide, cool water (less than 75 degrees Fahrenheit, or 24 degree Celsius), and a healthy substrate bed in order to be successful. Nitrogen limitation is also required to encourage the rich red hues from the leaves.
Preferred water hardness tends to be in the softer ranges, however, it has been known to grow in a KH of 8.
I thought the nitrogen-redness correlation was mostly a myth?