There is a lot of plants that can do just fine with your lights, and nothing else. Java moss, java fern, anubias, swords, anacharis, and cryptocoryne all good hardy low light plants. With these plants you just put them in and do nothing. If they grow to much trim them. Google "hardy low light plants" and you will see a lot of options. I have most of these plants and do nothing different from my non planted tank and they grow, look nice and green.