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Old 05-11-2013, 08:20 PM   #1
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What is this?

Just over the past I'd say 3 days I've noticed this in a few spots in my tank. What is it?
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Old 05-11-2013, 10:58 PM   #2
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The reddish stuff?

Based on the "new" look of the rock, my first guess would be Diatoms, second would be some sort of algae.
Both are things that a new system will go through during the first few months ... neither bad or good, just part of the system stabilizing.

My third option would be possibly the start of Coraline Algae... less likely than 1 or 2, but certainly a possibility.

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Old 05-11-2013, 11:19 PM   #3
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No calcium based algae in 3 days. I would say wait and see what happens.
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