Question about marine pure blocks

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ekoed

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Am I supposed to change these things out at any point? I have had 4 in my all in one sump for about 7 months. When I lift out the media basket they do look a bit dirty. I have added copepods so I’m hesitant to change them for fear of wiping out their current housing.
 

vetteguy53081

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Dirty is ok. Do not disturb- theyre doing what is intended
 
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ekoed

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Okay thanks. I just wanted to make sure they weren’t collecting a bunch of gunk over the time they’ve been there.
 

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