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The term "black percula" is horribly mis-used. And there are now True Black Perculas. Only Onyx percula and SI percula. Which are both sometimes marketed as "black percula". More often the term is use for black A. ocellaris. But it is also used for dark varients of A. polymnus and even A. clarkii. I think someone even said here that they saw an A. sebae marked as a "black percula" at there LFS.
So, which of these six possibilities were you refering to?
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Biology is the only science in which multiplication means the same thing as division.
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