Or you can try a chemical product called Green-X or Algae Destroyer. Those will kill off any algae and/or plants in the tank. I use it in my boyfriends parents koi tank because they get direct sunlight on the tank...works wonders, especially for green water.
i was also going to mention... why dont you get some more gravel? it will help with your water quality stability if you give nitrifying bacteria more room to grow
jm2c
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-Tina-
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20G Softies/LPS + Clowns Etc.
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