Help With Black Lava Rock

communityfluvalroma

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Hello all,

I recently ordered some black lava rock for my tank. It was delivered this morning, rinsed thoroughly and added to the tank around 6 hours ago. Two out of the three rocks have developed a white "coating". Does anybody know what this is?

Thanks in advance.

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PheonixKingZ

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Very interesting...

Is the coating just in the holes in the rock? Does the with stuff seem to be fuzzy?
 
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communityfluvalroma

communityfluvalroma

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No, it’s seems to be everywhere. Yes, it is fuzzy looking. If I just slightly touch it with my net, it comes away very easily from the rock.
 
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