3/29/13 Mini Update
The tank is high light, 2x 24w T5 about 13 in from the substrate. The atomic diffusers haven't worked at all for me, even pushing close to 50 psi. I tried two and neither worked, only a few bubbles would come out. I checked my regulator for leaks twice and it is all good. So right now I am using a cheap glass diffuser.
I have a 2213, which believe me I know is under powered. I did a gph test and it was 66 gph. I bought a mag drive 2.5 (250 gph) and tried running that inline with the filter off and the gph was.... 76 gph. I'm not sure how this is possible, it should have been at least > 180 gph. So now I am running a powerhead in the tank.
I would buy a 2217, but my cabinet is so low it wouldn't fit, and a 2215 would barely fit but with tubes it probably wouldn't.
This is why I am not using a reactor to solve my co2 problems. People say cerges reactors only slow your filter a tiny bit, but because my flow is so dismal I can't afford to lose any.
I think I will try your idea of floating plants to take up excess nutrients. I don't want to dose excel because the one two punch method advises not to dose excel since the algae may become tolerant.
Here are the photos
Still some dying algae left, I'll remove it tomorrow.