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Fluorescent Green algae grows on the sand and gets clumpy. It is not film algae - that is powdery. This stuff does not blow off. I admit I feed moderate to heavy. Two clowns and a Banggai cardinal convince me they are starving morning and night. Any ideas how to get rid of it. I might even consider chemical warfare I have never used any magic juice in this tank like chemi-clean. This stuff absolutely came in on a frag that is in the photo and appears to clean up with peroxide but then comes back. I try stirring up the sand and WC.