I did A layout in theory. The lines supplying the light ran up and over the Tank rim. three ( parallel ) lines were involved . One a bypass where the UV could be isolated, or removed for replacement or maintain . Yes bulb sleeve rinsing ect. Second line preset to treat algae. Third for parasites . So that with valves could be put on line right away , and I would have already set the flow . I saw another article where timing is important to start treating parasites , because by the time you see them they are established. I calculated flow loss into it as well. I have it drawn up with all the required fittings