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When I bought it, it was one large tile piece, however when the tile broke it wasn't attached where the break occurred. I just took it out and dipped it to see if that helps anything. Upon further inspection, the black and white spots are sand (white from my tank, black from the tank it was in prior)was it originally glued to the bigger piece of tile/slab? the first picture indicates it was
could be a ripped foot that became infected or allelopathy(coral warfare?)