Actually, most aquatic pumps are designed to be running 24/7 rather than turned on and off. It makes sense in a wacky sort of way, since an aquarium owner would doubtfully enjoy coming back from a vacation to see a container of dead fish. There are some pumps (like 12V bilge pumps) that are NOT made to be constantly in operation, but most pumps for aquariums should not have a problem running 24/7 (Eheim, Iwaki, etc.).
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