Looks awesome! Alk is without doubt the most important parameter to maintain consistency in a reef tank. Loved Marc's video even though it took like six times for Jim to explain to him that the alkalinity data reads thru a pH port that you just rename to AlkEven if it's accurate I don't think I would trust it to control dosing. Especially if I'm lax in calibration. The success of this I think will depend on how reliable it is without constant calibration.