Dom, I know geo makes a good reactor but its not the cheapest. IME the basics of a calcium ractor is all the same but the few key factor you need to look out for while shopping for a reactor, at least for me is the ease of filling it. I personally hate thumb screws, large opening is always better. Second is a ph probe, I don't count bubbles so I rely on the probe to adjust the level of CO2 going in. Third will be the reverse flow or upflow design which uses less CO2. The last is replacement parts, every thing has a limited life to it so if you can't find replacement then I wouldn't buy it.
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