I'm using ozone. goes in through the air line into my berlin skimmer. I'm using an air dryer and orp controller . I have the orp controller set at 420. It really makes the water turn crystal clear. Like mentioned in a post above---you can really see the difference when you do a water change using a white bucket. Before the ozoniser, the water was almost yellow, brown in tint, after using ozone, the water is clear. I have a mixed reef tank and everything is doing well.
Cello
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