Do you have the chem-marin in-hand? A quick look on Marinedepot gives me the impression that its reef-safe and only needs a few hours with the pump off to be effective. If that's the case then the bucket treatment could be reduced to overnight (with heater and may be just the air stone halfway down) or eliminated and just treat the rock in the DT. You should definitely look into it beyond my suggestion though, since I've never used it or read the label.