I decided to go with the Aquamaxx T1. I was wondering if anyone has any experience with them? Either way, I bought the reactor, the calcium and MAG media, Co2 tank and regulator. It says I should use a Co2 check valve. My questions is, do I need one ? What kind of pump do I need? It says an aqualifter is recommended, but isn't that basically an air pump? The third is, once I get it all set up, how long after should I discontinue my dosing pumps?