Join Date: Aug 2003
Location: Kelowna, BC, Canada
No, it'll be fine. Sure, it'll lose some CO2, but not as much as you think, and although not as good as a cannister, it's quite accpetpable.. I've even used a mini as an injector on DIY CO2 to raise a 10gallon to 65ppm (accidentally)! As for overall flow, it's still not too much. All of the Aquaclear's can be adjusted from full, to a pretty medium/low flow-rate, allowing you to literally customize the water movement.
But yes, it will cause "some" CO2 loss.
Plants are gone, but my 33gal and I are back after a long hiatus.