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Cleaning Old Live Rock


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The purple is what is called coralline algae, it's something saltwater and reef hobbyists strive to get on the rocks in their aquariums. There are companies that make "fake" live rock for the saltwater hobby and they also color the material they use to make it appear as if it is covered in the coralline algae. By looking at this piece I am going to guess that this is what you have, as most natural live rock has a lot of small holes and crevices, whereas this piece is pretty smooth. Now, someone could have taken a piece of rock and thrown in a SW tank and it grew, so what I would do is put some vinegar on an area, let sit for a short time and see if it softens it up that you can scrape it off.

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