Gaurang, I am not a plant expert, however by reading this forum I have seen reference to this plant requiring low to middle lighting levels by Ceg, who knows more about plants than I do. The ability to create this type of lighting level is quite simple with the light unit you have in a standard 48" aquarium. However to gain the optimum environment you may need a slightly deeper tank or a facility to hang the light or change the height of it from the aquarium. So in answer to your question what size of tank, this part will depend on what lighting environments/effect you are after. I would suggest going for the largest size available at the 48" size (providing the maximum amount of water volume for stability) with a restriction on the depth to 18"-24" and the a restriction on breadth as you may not get the lighting levels required if it is a 24" breadth or greater depth. As the light unit is long and narrow.(although we do not know if the light is optically enhanced for the light spread or the PAR depth level limits produced). So you would have to decide if it is to be 12",15" or 18" in breadth. Hopefully this will provide a rough guide to a tank size that will allow you to carry out the task of growing your desired plants. Obviously look through the journals of people who have grown this plant to get background information on what they have done to succesfully grow it. Hope this helps you decide?
