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Blue green algae in Rift Lake tank


I have a 29 gal Rift Lake tank with no plants, one 20 W strip light, a pH of
about 8.3, and high GH and KH. The substrate is a calcareous material, with
landscaping of "moon rock", a shell-based agglomerate.

For reasons which I don't understand, blue green algae proliferates like
crazy in this tank. Why is this happening and what should I do to prevent