New live rock

Digicop

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I just purchased live rock that the seller said was in his take for six years. It has some brown course algae growing on the rock. Should I leave this or remove it? Can anyone identify it from the picture?
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vetteguy53081

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Looks like what is known as chondria or a relative of. A type of algae you want to try and peel off, not pull. You can place rock in hydrogen peroxide solution to make it easy.
 
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