Hi Scapegoat, All of these plants are tissue culture plants. Of course, you already know the Japanese dwarf hair grass. The stem plant to the far right is called Rotala Macranda sp. Mini Butterfly, I have also seen the name Rotala mini pink. AFA sent me this plant by mistake. I have had the grass and this narrow leaf rotala in my 10 gallon for almost a year now. The Rotala mini pink was growing so fast that at one time it completely covered the entire back and sides of the tank. It is a pretty, graceful plant. It is brownish-red with petite hot pink tips but if you let it grow tall and along the surface of the tank, that part of the stem will become bright red then you can cut the red part and replant it, if you want it completely red. In my tank, the stems grow very straight, don’t branch off too much and become scraggly, when I received the plant there were eight little stems that looked like the international sign for hairpin turns! I have come to really like this plant.
The green stem plant is Rotala Ceylon.
The tall orange plant is Rotala Macrandra. This is a beautiful plant when seen in person. The plant can become redder. The leaves have a beautiful translucent quality that makes the plant seem to glow. It is the most beautiful stem plant I have ever owned. However, it is probably not an appropriate plant for a nano tank. It grows very quickly and it has a large diameter. This plant, the green stem and the next were planted in mid-April, The plants were 1 to 2 inches tall. I have trimmed down all of the Macrandra stems at least once already!
The deep red plant to the left is Ludwigia Repens super red. I like that the leaves of this plant have a different shape. I ordered this plant because I had heard that the Rotala Macandra can be delicate so I thought if it died I would have the Ludwigia. I think the Ludwigia will do well in slightly lower light than the Rotala Macandra or the Mini Pink.
I hope this information is helpful to you or others who may read this thread however I feel I should add that I am not one of the sophisticated aquarists who are forum members here but hopefully some of this info will be helpful and I will rely on others to correct any misinformation I may have provided. All the best, john