scolley -
I know you aren't a proponent of boosting CO2 as an algaecide, but the one time I had GDA woes as you do, I boosted my CO2 a bit and it disappeared almost overnight. I have kept my CO2 levels at that rate ever since, and my flora and fauna are doing better than excellent at this time. I consider my setup to be at the higher end of the spectrum with regards to light output, tank depth, etc. Since light is the driving factor, I thought maybe I was a tad deficient in the CO2 department.
I am not suggesting you do the same. I am merely sharing my experience. GDA was a pretty severe issue with me with respect to algae problems. Now it is a thing of the past (except for weekly minor cleanings right before the water change).
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