Standard disclamer: I am a total and complete hopless n00b, but from what I have read while researching planted tanks, it seems to me that those lights probably aren't enough light to get good growth. It's not just the light you want, but the quality of the light (certain spectrums of light are more idea for plant growth, most "planted tank" LED's have a few red LED's and such to provide it).
To answer you question, though, bearing in mind that I AM a total n00b, I would buy a glass lid that would fit on your tank (another full disclosure, I hate these big bulky black plastic hoods), and some sort of LED light that is advertised to be for a planted tank (I have a Finnex Planted+ that seems to work pretty nicely so far, though I've only had it for about a month). Other members would be able to advise you better on CO2 supplements better than me, or even on setting up a full-blown C02 gas system.