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Martyn-I hear where you're coming from and agree to a certain point. But ozone is created naturally over the reef by UV hitting the water's surface. And if excess ozone is kept from the main tank using carbon or throttling back the generator, no bacteria should be lost. My concern is with the chronic yellowing I have in my tanks preventing the corals from getting all the light they need, and having seen multiple natural reefs I can say that, at least on the days I was snorkeling, the water was absolutely clear (what I call "blue water").The yellowing compounds can be reduced using GAC and not ozone, I just choose ozone for practical purposes (it's free). Plus, it makes my dog and cat infested house smell a lot better. lol
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