I've been noticing this weird behavior in goldfish on and off for a few months at work. Every once in a while after a new shipment I have to split up tanks of goldfish.
One fish gets completely banged up on. Its almost always two other fish who push their faces into the... "Butt" of the chased fish. They do this for hours, very much stressing the fish being chased.
I thought at first it was a territorial issue...but have never known goldfish to be territorial. Then thought maybe a mating thing...but I thought goldfish only bred in very cold water(water at work is on a chiller, temp steady at around 60F)? Or do I just have bullies? I think it really means something since the fish seem...quite literally, to have their face all over the butt of the other fish.
Thanks guys! I'm totally lost on this one.
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