hi ive got a 155 bow front tank with a 40 gal sump that ive had going for a few years now. ive always dosed two part but finally really want to step up to a calcium reactor so i don't have to daily dose and have 1 less thing to worry about as well as get the benefits of getting great growth out of my sps and other corals. so my question is what brands are good, what do you need to get a full set up going and if you currently own 1 do you like it, as well as what are the pros and cons of it.