JbJ 24g nano filtration dues and donts?

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Jcs401

Aquarium Advice Apprentice
Joined
Apr 9, 2013
Messages
45
Should I leave this(picture attached) filtration in my nano?? I was told they hold nitrates, nitrites and its better to not have them. I have a protein skimmer in first chamber. Do I need these micro filters in second with bio balls and carbon in Devon or is it more harm than good?? Any help would be great as nitrates, nitrites are running high..
 

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