We don't often worry about the mental state of a fish, but fishes enjoy stimulation and something to do, just as much as land animals. Aquarists know that the environment is important for keeping fish in good health or bringing them into breeding condition. That doesn't just mean places to hide and clean water to swim in; it can also mean a variety of foods including live food to chase, the right tank mates, the right plants, and, yes, an opportunity to learn.
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