Dry Rock covering

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luca5927

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Hello everyone. When I started my tank It began with dry rock, upon closer inspection I have noticed that there is some epoxy type substances covering certain sections of it. Does anyone know what this is?
IMG_2719.JPG
IMG_2718.JPG
 
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Billdogg

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It looks like natural coral skeleton to me. My guess is that part of those rocks were the underside of a coral ages ago.
 

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