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need some fish help

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I know betas are fighting fish; I only have one by himself in it's own tank, nothing else but marbles and a water plant. - but I came home and his tail is gone and it looks red and bloody. there isn't any blood in the water though and his tail isn't floating around anywhere. I'm just wondering if anybody else has heard of this b/c I can't find anything on-line and it worries me that my fish is so self destructive. he's about 2 years old. is this something they do near the end of their life? is it a fish disease? anybody?