How to grow red stem plants successfully in planted aquarium

Red stem plants are regarded as difficult to grow for the following reasons:
1. Red stem plants prefer mildly-acidic soft water.
2. Requires high light conditions and accordingly, sufficient CO2 injection.
3. Requires continuous iron supplementation to maintain the plant's leaf color.
When we make diy substrate sand  as the main substrate material,
it is difficult to prepare and maintain mildly-acidic soft water.
In addition to this, growing red stem plants was also a tough job because these plants are
demanding in terms of light, CO2 and nutrient conditions. Now, it is no longer
very difficult since the water quality issue can be resolved by the use of commercially available planted aquarium soil  like ADA AQUASOIL, PLATINUM SOIL, with which you can have mildly-acidic aquarium water just by placing
it on the substrate. Among red stem plants, Rotala Macranda is one of the most
difficult species. It is because the plant very often melts and wilts except
the terminal bud portion if the plant is sold in poor condition; and it is
therefore very hard for it to develop submersed leaves adapted to the aquarium
environment. Pogostemon stellatus and Gratiola sp. have vivid red tint when
grown under high light condition and supplemented with IRON or other types of
additives containing rich iron, but they lose their beautiful red color
significantly with low light or insufficient iron supplementation.  If you
wish to maintain the red color of stem plants, you need to add iron
supplements on a continual basis.