With the frag system, I decided to use dosing pumps and a triple dosing reservoir. I sell the products I use myself, after all. Plus, so many hobbyists don't use a calcium reactor these days, so having a common task makes answering questions easier. There are many brands of dosers on the market. I chose to use the independent Icecap Dosing pumps. You can daisy chain them, adding three slave pumps to the master pump. I only needed two and one for this tank. All three pumps are wired to a single power cord, and are placed on a small shelf above their dosing reservoir.