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I was thinking this was diatom, but as time has gone on it is looking a lot greener and hairier now, so I'm not sure which this is. A few parts even have a purple hue. Can someone ID it for me: http://farm3.static.flickr.com/2169/1793012087_c51a74dadc.jpg?v=0

I have a 24 gallon AquaPod and have several corals in my tank. Over the last few weeks the tank has really been overrun by brown diatom algae. I've cut back on feedings, I do 10-15% water changes every Saturday, I've cut back on lighting, I've added a power head pointing to the surface, I...