Canister filtration is not a popular choice of filtration for marine, mainly the difficulty in keeping it clean as its troublesome to regularly open and clear the inside. Detritous can accumulate within it and result in it producing excessive nitrates.
Rest assured, it can definitely work but a sump tank is by far the most popular choice of filtration for marine aquariums.
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A fishtank is just like your computer. When your tank crash(OS crash), its time to cleanup(reformat hard drive) and setup(install OS) again and add new livestock(re-install software).
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