Hey Scott,
Let me know how those pumps work out for you. As my sps get bigger and bigger, I am having to dose more and more Ca and Alk. I am currently dosing once a day at night after the lights go off. But I would like to provide more stability to the tank by dosing it over a long period so I don't shock my system every night. I've thought about getting the Drew's dosing pumps from BRS or ponying up for one of the Aqua Medic Reefdosers.