You are having algae problems because you very likely have too much light. Two T5HO bulbs mounted close together with good reflectors, and sitting on top of the tank, will give you over 100 micromols of PAR on that tank. To use that much light you need to do everything else perfectly or you get lots of algae. The hardest thing to get right is CO2. You need that to be at the optimum concentration, which isn't much different from the concentration that will start killing the fish, unless you have a lot of oxygen dissolved in the water and good water circulation in the tank. You can raise the light fixture about 8-10 inches above the top of the tank, to reduce the intensity about in half, and make life a whole lot easier for you.