[erikages]

According to Sprung and Delbeek ("The Reef Aquarium," volume 3, pp326-330), running a small amount of ozone (e.g. 5 mg per hour, if mgs are the right measurement) helps to "align" large org. molecules and thus makes them more available to the skimmer.

Too much (sterilizing quantities) dramatically reduces a skimmer's productivity.

Based on Sprung/Delbeek, I reduced ozone, and noticed a wonderful increase in the quality of skim.

Hope this helps.