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The cleanest tank i saw was a substrate free tank. 180 gallons. Live rock in the middle. Metal halides.
His skimmer was 5 ft tall beckett. He ran ozone. He ran carbon and rowaphos which he changed every two weeks always. Water change every two weeks.
Apparently carbon/ozone/skimmer can remove 100% of doc.
As mentioned in the other thread I don't see 100% removal of DOCs likely nor wanted.