As with most things in this hobby read about it then find more info and read that. Any changes to a tank should be done slowly, with reactions from the inhabitants determining when to do another change. ORP as stated in the article above is very erradict, but until a better way of testing comes around is the best method for running ozone. Just remember to go very slow if you start to run ozone. Ozone as with many other additives can be benefical to reef aquariums. But you have to know what is happening and also all of the possible negatives that can be created. IMO
RIch
RIch