Im a real newbie to this and Im looking for help with programming a DOS to change 10 percent/ 12 gallons very other day with each tank being changed very other day. Refugium 40gal feeds two 120gal using DOS and ATK. Intend to use one side of DOS for each tank to remove water then use ATK pump to pump water from refugium to alternating 120s. ATK sensor and shut offs are in refugium and will use 2 optical sensor in each 120 for high and low monitoring.


Lots going on here I know, so any help or suggestions would be helpful.