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Old 05-12-2013, 06:14 PM   #1
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LR turning yellow since new light.

I purchased a new led/T5 combo light about 2 weeks ago and one of the lr close to the top has gotten yellow. Could it be that the light is killing the rock. Should I place the light higher? I'm attaching pictures.

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Old 05-12-2013, 09:10 PM   #2
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Looks like Diatoms. How old is your tank?
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Old 05-12-2013, 09:19 PM   #3
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I started my tank on march 19.
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Old 05-12-2013, 10:53 PM   #4
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+1 on diatoms
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Old 05-12-2013, 10:57 PM   #5
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Is this good or bad for my tank and if bad what should I do? Also, what causes it? Its a 15 gal tank.
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Old 05-12-2013, 11:06 PM   #6
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Silica in the sand and new rocks being consumed by diatom bacteria. It'll go away once the silicates are gone. Normally 1-3 months.
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