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Lighting and algea problems

    I have a planted aqurium for four month. For the past four month, thee
algea growth are minimal. I use 2 15w flouresant, and 2 13w compacr
flouresant over my 20 gallan high tank. In the past week, a new king algea
appeared. It is thin, long threads with dark gray green color. the lenth of
the threads are 2-3 inches. It grow on leaves of my plants. Also, I'm
setting up a new light fixture by using GE's Chroma 50. Could anyone tell
the color of the Bulob. Is it like real sunlight? Should I use 3 or 4 bulbs?
Is 4 bulb to much light?

Thank You