An extern aquarium pump is place out of water to clear the water or filter the water. For more detail please check here: https://atbuz.com/aquarium-water-pumps/
External aquarium pumps are very powerful pumps that pull water out of the aquarium as well as return filter water back to the aquarium. In addition, external pumps are used in order to run protein skimmers and different types of filters such as canister filters.
If you're not using any lights or pumps in your aquarium I advise
you to get an aquarium fan it will definitely do. If you do use thing such as
lights and water pump that warm up your tank you should definitely get a
chiller, try the Oceanic Aquarium Chillers.
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