Hair algae has been the bane of my existence. I finally got dependable CO2 production so that CO2 is in the "good range"-don't test frequently enough to give current stats. Switched over to PMDD exclusively and keep it on the lean side.
No hair algae!
I went away over the holidays and didn't feed them for a few days and as a result my black tetras are eating the duckweed. All in all, it's been a very good 2005.