I have had an awful algae problem in my 20 gallon long since I started it 2 months ago. I started a fluval 2.0 on the tank. In the beginning, I had the light on for 10 hours. Algae ran rampid and coated every surface. String algae was everywhere. I then changed the light to 8 hours. The string algae disappeared, but brown algae still covers every plant. I dialed the light down to 6 hours today in an effort to get rid of the brown algae on all of my plants. Any suggestions on how to get rid of my algae problem and what I’m doing wrong? Pics are attached