If there's one thing close to a magic bullet for me it would be co2. I would never set up another tank without co2 regardless of the light being used. All tanks without co2 are co2-deprived thus slow growth. Slow growth makes it much easier for algae to exist since organic waste is left in the water column to decompose and release toxins like ammonia. Nothing takes up ammonia as effectively and continuously as healthy fast growing plants. Water changes certainly help and are very important, but are second to healthy plants. Without a large plant mass then water changes, organic removal (both manually/filter media) are even more important. The key is uptake and clean water. The more light, the more important all of these things are to an algae-free tank.