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Old 09-14-2006, 12:42 AM   #1
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Brown substance covering LR?

When I came home tonight a couple little pieces of LR that I bought last week that were covered in purple coraline are covered in brown? Is this some sort of algae? My tank has been cycling for about 2 1/2 weeks.

Will the purple come back ?

Thanks
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Old 09-14-2006, 12:46 AM   #2
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If you can brush it off and it swirls away like dust in the water, it's probably diatoms. They'll die off given a little time. It's common in tanks that are newly set up.
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92-gal Corner Bowfront: VHOs,PCs,LR,LS,Sump,Skimmer,Fish,Soft Corals,LPS (Born again 9-04)

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Old 09-14-2006, 12:52 AM   #3
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Should I reduce my light time? I have it set for 5 hours a day during the cycle, however I turn it on when I am home because I don't have corals or anything?

I sure hope it goes away because it is uuugly
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Old 09-14-2006, 02:19 AM   #4
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If it is diatoms, they are feeding on phosphates. I forgot to ask...are you using RO/DI water or at least distilled water? If so, the problem should clear up in a few days. That light schedule is short and OK for now.
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Old 09-14-2006, 11:48 AM   #5
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I agree with No_Floaters, sounds like you are good to go! I would run my lights 8-10 hours once you have some livestock in there. I only run mine for 8hours, lots of folks run 10. I really wouldn't run longer than that.
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Old 09-14-2006, 03:29 PM   #6
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Diatoms are completely normal in a new, cycling tank. Just be patient and it will go away. It will get worse before it gets better though.
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