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it looks like not only is he a horrid tail biter, but he may be a marble. that kind of red... it doesn't look bad. i had a pure white Halfmoon Plakat, who got some pink on his tail and anal fin. it's nothing bad, just red wash. whites often do that on us. just keep an eye on him, and keep his water clean for the fin to come back in. he's very beautiful!
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