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Don’t worry, it often takes a couple of weeks to achieve constant levels. Mine started low as well and over a month gradually reached 400 or so. The tank was 2 years old at that time. It runs at 380 - 410 very consistently. If I wash equipment with peroxide and rinse extensively prior to returning to the tank, ORP immediately falls to 250 or so then returns to 400 within a couple of hours. I do a 20% water change once a month which has essentially no effect on ORP.
Between 350-450Hi all I am going to run ozone in my reef tank , I was just wondering what is the right level for orp to be set at on my controller is it 200 or 400 been reading the last thew comments above , so any pointers please would be great