Well, First I wish to make it clear I didnt come on hear to fight with anyone. I do this for a living and have for many years. I didnt see a thing about a reef set up mentioned. And if ANY one dosent believe that a UV is worth the investvent. Then they have never installed one properly. They are a great tool for fish. Someone just told me about this site last week so I looked it up. As far as air, what matters is the number of bubbles bursting at the surface. It makes little differance how it gets there as long as it is clean.