Angry fish in tight space

Everyone who have had community aquariums for a while would notice that there is this aggression issue among the fish. Some fish will keep nipping at other fish, while some other fish will go all out attack and injury or even kill other fish. Sometimes it occurs amongst the same species, but sometimes it can also happen between different species. We originally thought it is only due to some fish are naturally territorial and aggressive.

It seems study show that in tighter space, everyone can become more "angry". Naturally some fish can become more aggressive in a closed system such as an aquarium. Some perfectly peaceful fish in the wild can become nippers and aggressors in a home aquarium.

Look at this angry face.



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Don't get a tank that is too small. You will have a lot of angry inhabitants.