I have the opportunity to get a Geo 618 calcium reactor, regulator, CO2 tank, and new media for a pretty good deal (I think haha), but I'm weighing out the pros and cons of using one. For those of you using, or that have used, a calcium reactor, do you think they're worth the investment? If not, why not? I want to hook this up to a heavily sps dominated nano tank (about 40 total gallons). The goal is to get used to this gadget up until I upgrade the system in the next year or so.