other than water clarity what are the main benefits of running ozone in a reef system, particularly a sps dominates sytem?
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It mostly breaks down and/or binds to organics which in turn clarifies the water. If you run carbon at the same time, ozone makes the carbon more efficient. And of course it raises orp, which doesn't really mean all that much. There are a lot more complex things going on with the use of ozone, but this is the main thing that the typical aquarist cares about.
Ozone is a very unstable molecule and will react quickly to whatever it can. Usually, it gets used up in the reactor chamber before the water ends up back in the aquarium. If it is overdosed though, it will do just that, and cause all kinds of problems. This is why you would want to use an ORP controller. If you start to overdose, the controller shuts the ozone generator down. You can also run carbon in the reactor out flow to pick up any extra ozone left over.I have always wondered this as well, it was my understanding that ozone is a reactive oxygen species that would react with many organic compounds. If this is true it would seem to me it would also react with the healthy tissues of organisms in your reef system as well. In my mind this to bring up its questionablability as to the benefits vs. the harm it would potentially cause reef organisms.