If it's only 10 gallons, you won't need both strips. If you say combined they are 30W, then one light should be around 15W. I would only stick with 1 light and see how it does. Should be a lot better as you'll be around 1.5W per gallon. Low tech tanks need roughly 1W per gallon.
EDIT: Unless you want to stick with a high tech tank, keep the two strip lights, and you will need to get pressurized CO2 (as I said in a previous post) or you can look into a DIY CO2 (paintball CO2 is prolly your best bet)