Tank dying?

Brandon7878

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Not sure what's going on with the tank but I have my sand bed turning brown. I think it's killing my tank. Help me please!!
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Tahoe61

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Looks like it could be cyanobacteria and or diatoms. Tank looks fairly new?
Neither should be so severe that it would kill the tank. I would start with routine water changes, nutrient reduction, use only RODI water, get base line values for phosphates and nitrates. Does the tank have enough flow?
 
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