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what is this on my sponge? the blacky brown stuff?

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<a href="https://mail.3reef.com/gallery/photos/sponge.6397/" title="sponge by newreef94, on 3reef Aquarium Forums"><img src="https://mail.3reef.com/data/photos/l/6/6397-1339445102-04fc5722a0ac598a6fd9eb60c8538c42.jpeg" alt="sponge" /></a>

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[URL=https://mail.3reef.com/gallery/photos/sponge.6397/][IMG]https://mail.3reef.com/data/photos/l/6/6397-1339445102-04fc5722a0ac598a6fd9eb60c8538c42.jpeg[/IMG][/URL] [URL=https://mail.3reef.com/gallery/photos/sponge.6397/]sponge[/URL] by [URL=https://mail.3reef.com/gallery/authors/newreef94.26848/]newreef94[/URL] on 3reef Aquarium Forums