Join Date: Oct 2006
Location: Leesburg Virginia
I also use a 90 degree in the left rear corner, aimed straight at the front glass. This creates just enough turbulence to eliminate surface scum buildup and adds O2. I only need to add about 1.3 bps co2 for a slightly yellow drop checker. I use an in inline diffuser on the output of my canister filter. The aquarium is a 46 gallon bow front.