Theres a lot to consider about UV. First and foremost, what are you trying to accomplish? UV has different efficacy on different issues. Killing bacteria or free floating algae is a different game than killing ciliated protozoans. Both are possible, just have to plan a little different. I personally run a 57 watt UV inline with my return pump on a 60 gallon display for a bunch of different reasons. It is controlled by my apex and will turn off for functional reasons (return pump not running, etc) as well as after feeding or dosing any materials that woud be negated by the UV.