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Goldfish Nipping Tank Mate: Spawning or Aggression?

A 6-year-old goldfish eats a 5-year-old fantail's tail. Robyn suggests:

  • If male/female, male may be trying to spawn (chasing vent area).
  • Injured/sick fish get targeted by tank mates.
  • Separate immediately; treat fantail with salt, Maracyn, and MelaFix.
  • Tail may partially regrow.

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