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When choosing an aquarium pump, several factors should be considered. The pump's flow rate, typically measured in liters per hour (l/h), must match the aquarium's size to ensure effective water circulation. Energy efficiency is also crucial, as pumps operate continuously. Quiet operation is an added benefit, especially for aquariums located in quiet spaces like bedrooms. Lastly, ease of maintenance ensures the pump stays clean and operates efficiently over time, providing a stable and thriving aquatic environment.