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The best DIY way to inject the CO2

If you have a cannister filter, the best way is to split (longitudinally)
the last inch of the air tube carrying the CO2.  Then spread the split and
rubberband it to the intake of your cannister filter.  As the DIY CO2
supply squeezes bubbles down the air tube, they will be sucked into the
cannister and completely dissolved before the water is returned from the
cannister to the tank.

I can't wait to see what methods other people use.

Macon Cowles
1680 Wilson Court
Boulder, CO 80304
(303) 447-1332