I like the Aqua units. They are modular, so if you want to move up from the power just needed for greenwater control to a dose that would be lethal to parasites, you can add on modules. They also have a wiper system to clean the bulbs without taking the thing apart. As was stated above, they do require some room to set up properly which might be tricky under a stand, but easy in a fish room.
That being said, you will probably do better to focus on nutrient control for the algae.