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Old 04-01-2014, 03:16 PM   #1
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What is this growing on my rock!?

Does anyone know what this is? It's a dark brown/ red color. It won't wipe off. It Doesn't seem to be spreading. I'm assuming it's some sort of algae. I do weekly PWC and keep my aquarium healthy. Could this be harmful to my fish? Click image for larger version

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Old 04-01-2014, 04:21 PM   #2
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What are your water parameters and how long has the tank been up and running? I have purple/red algae on my rocks and my mbuna graze on it all day, but yours is a deeper purple than I've seen. I'd rule out diatoms since you can't wipe it off as well.
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