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My powerhead is so small that it's probably only considered a water pump. There is no way to connect the CO2 tubing to it, so I use the airstone. If you can get your CO2 line into the powerhead, it would be the same as connecting it to the canister filter. The end result would be chopped-up bubbles being sent throughout the tank. This is a great way to get your CO2 into the tank.
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