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Tanks been running since early December 2010 I do syphon it with a gravel cleaner when I do a WC but with in the week it grows back! Yes I use RO water
Deff. Diatoms. How much water flow do you have. I had a similar problem when my tank was just starting but put 2 MaxiJet 1200s in there and have been good ever since
my sand looks like that too but my tank is only a month old. Im hoping that they go away soon. I have to clean it off the glass once a week or so...maybe less