Aggressive goldfish?

  • We are currently upgrading MFK. thanks! -neo
Yeah when mine were nasty and killed the smallest they were in a 10-15 gal tank with 3 goldfish are rarely any water changes for a year or so with a sponge filter. I was very young.
 
well from whats been said with little or no filtration, the fish have been agittated by the ammonia, and therefore get qggressive
 
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