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Old 04-14-2016, 08:46 PM   #1
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Purple coating on rocks.

I've had tank for a week now. The only thing that's changed was the salt and the PH. No ammonia no trites or trates

There is purple on the rocks as it is all live excluding the fake piece in the middle. I don't have lights yet, however I do have a heater and a powerhead.



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Old 04-15-2016, 07:14 PM   #2
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Purple means cyano. Cyano means poor circulation and nutrients in the water column. Pretty common to see when a system is getting up and running as those nutrients are fueling your cycle.


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Old 04-15-2016, 07:18 PM   #3
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Purple means cyano. Cyano means poor circulation and nutrients in the water column. Pretty common to see when a system is getting up and running as those nutrients are fueling your cycle.


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Cool thanks. I got the live rock from a local pet store. Had the purple stuff on it when I got it.

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Old 04-15-2016, 07:28 PM   #4
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If it is hard it could be coralline algae then...or even a rock colored purple to imitate such.


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Old 04-15-2016, 07:36 PM   #5
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It's just where the holes r on the rocks. Not covered.

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Old 04-15-2016, 07:38 PM   #6
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It's probably just old coralline algae.


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Old 04-15-2016, 07:44 PM   #7
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How do u know if it alive or not if it's old?

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