What type of lighting and bulbs do you have on your tank? Lighting determines the type of plants you can use but basically you could do Crypts in the substrate. There are tons of different species but you will need to put root tabs in the substrate to fertilize them as they are root feeders. Then you can do Java Ferns (all types), Anubia's (many types), and Bolbitus. All of these do best when tied onto driftwood or rocks. These are all simple low light tolerant plants that don't need special treatment BUT anytime you have plants it helps if you'd give them a dose of Seachem Flourish Comprehensive weekly after a WC to give them some nutrients. No CO2 is needed but liquid carbon such as Flourish Excel can be used if you would want to.