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I don't have experience with fish, but the study results do make sense. When we lived in a small condo, our first home, our alpha male cat was very aggressive with the other cats. He seemed to be in a bad mood quite often. When we moved to a large house, he settled down and seemed much more at peace. Even humans living together in tight quarters, with no "space" of their own to be able to have quiet time and privacy can get very angry and aggressive. I think it must be the same with many species - fish included. Cute pic of the fish you posted! LOL
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