HI everyone, I was wondering if anyone can recommend a vertical plant to add to my 20G (tall) low-light, no CO2, tank. I have some java ferns which are doing well, and a compact amazon sword. I was hoping to find something that grows vertically (12 to 14 inch or so) and thin, to put in the corners of the tank, since the top half of the tank is void of plants. However I don't know if any such plant thrives in lower light. Any ideas?