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Fish don't really sleep in the same manner as most animals. They move into more of a decreased activity state in which that make minimal fin movements only to stay upright.

Do they need dark to sleep? Well that depends on the fish really. Some fish are nocturnal and come out during the dark. But the general answer is no, they don't need it to sleep, but it helps let them know that it is time to start sleeping.

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13y ago

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