11-03-2012, 04:40 PM
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Boredomb accurately described things, so my comments are just agreeing from my personal experience with this same light over my 10g.
I have not had brush algae in the 10g, but I did have some very beautiful algae that I think might be Spirogyra, or Silk Algae, but not sure. It appeared at the surface among the floating plants.
Brush algae on Java Ferns is due to the ferns being in direct light. I have this problem in my 33g, if I thin out the floating plants over the JF. Beyond this, if any green or red algae is increasing, reduce the duration. My tank lights are on for 8 hours, and this has proven to be the longest I can go without brush algae increasing in the other tanks. And all get twice weekly dose of Flourish Comp, at slightly more than the label amount. In the 10g for example, it is just slightly less than 1/2 a teaspoon twice weekly.