I set up a 9 gallon fluval flex about 2 months ago using uns controsoil and cosmetic sand. I have Ludwigia acruta as the stem plant, the inclinata just melted on me. I also have crypt parva, anubius nana petite and java fern. The left and right sides are looking empty now since the inclinata melted so I would like to add another stem plant that will thrive in this set up. Something very green or red! I won’t be adding co2 and I dose a all in one liquid fert once or twice a week. Any suggestions on a hardy low to medium light plant that will do well? Thanks for any help.