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Old 09-06-2005, 05:53 PM   #1
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red and green sand

ive recently noticed a large portion of my sand collecting or turning red and green. Im thinking that maybe its just coraline algae from when i scrubbed some of it off the glass but i was just wondering if anyone knows or can confirm what this is. THANKS!

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Old 09-06-2005, 08:33 PM   #2
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Probably cyanobacteria. It comes in a number of colors.
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