I am looking for some dark green plants to grow behind my R. macrandra. Currently this spot, 8"Long x 6"Deep x 12"high, is occupied by some corkscrew val. and H. poly. I am itch'en to dump. My tank has been running for 5mo.is settled in nicely and I am starting to fine tune my arrangement. Please suggest some possibilities for consideration. Jeff Kropp Oakland CA.