Join Date: May 2008
Location: Phoenix/Flagstaff, AZ
Yup, probably hair algae. I would personally recommend picking up a bottle of Flourish Excel and a syringe, and using the "target" method. Turn off your filter and squirt the excel right on top of where the algae is (a small amount goes a long way). Let it sit for about 10 minutes or so, then turn your filter back on. You should notice that the algae turns red or white after 24-48 hours, which is a good sign that it is on it's way out. If you don't notice any color change within a couple of days, repeat the treatment.