[Russter]

Place your xenia anywhere in your tank. As stated above, it grows well in all kinds of light and flow. If you can, place it in a spot that is isolated from other rocks because it will very quickly grow and attach to other rocks. You will have to experiment if you want it to stand straight but I wouldn't worry about it. Mine waves back and forth from one side all the way to the other. Put your duncan about 1/2 way up on your rocks with medium water flow and it should do fine.