dosing pump selection help

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I just set up the Bulk Reef Supply 1.1ml dosers for Alk and Ca on my tank. I have them hooked up to my Neptune Apex. So far so good - I went this route as opposed to a separate doser simply because I had the Apex and there seemed to be no use in getting a separate since I already had that controller. They seem sturdy and reliable - although I am only a short time in.