What is this on my live rock?? - Tropical Fish Keeping - Aquarium fish care and resources

 
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post #1 of 6 Old 06-07-2011, 08:29 PM Thread Starter
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What is this on my live rock??

i discover this black tar looking thing on my live rock. Can anyone tell me what this might be?

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post #2 of 6 Old 06-21-2011, 10:48 AM
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my friend has the same thing, i was told its bacteria, which i believe is the good stuff for your tank. just check on it but i've been told its good.
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post #3 of 6 Old 06-26-2011, 08:50 PM
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looks like some sort of sponge. i just got 40 pounds of lr the other day and its coverd in that stuff and flakeing off as i cure it. the underside looks and it feals like sponge.
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post #4 of 6 Old 06-26-2011, 11:30 PM
How long has the rock been in the tank? It looks like die off. But I'm just guessing here without other info.
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post #5 of 6 Old 06-27-2011, 02:22 PM
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my guess is that it is coraline algae.
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post #6 of 6 Old 06-27-2011, 03:36 PM
I guess if the light was hitting it weird. Yea it looks hard like Coralline. But I'm with you.
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