Black and Red Phantom Males do the most awesome fin flaring mock battles of any tetra species. Reds will go scooting around the tank at the most absurd angles to each other. I've seen them nearly standing on their nose and laid over at 90 degrees. A visting friend though there was something wrong with them.
Starting small, keeping it simple..(?)
85 gallon stock tank, "pond"
5g low-tech Java Fern jungle.
2.5g +1.2g satellite stream-clay
-subsoil crypt and Fern tank.
Pendant-hooded, LED A19 bulb lighting.