Hey everyone i have a 40 gal wich i am trying to make into a amazon biotope. So far i have angels, cardinals and bleeding heart tetras that are all doing fine. As for the decor and plants what kinds of plants should i use? i have an amazon sword a crypt, some stem plant witch i have no idea.(might be ludwigea), java fern and duckweed and water lettuce. i was wondering how to make the water turn dark, Not tea colored and not green like with the lettuce but dark. I have heard LED but not sure. Any other amazonian plants i could keep? Thank you in advance!!!!!