Not sure if there is a need to outright replace it, as in 'being old/worn out'. But I do add to it a couple times a year. What I vacuum out with water changes I just replace and add a couple pounds of new along with. Maybe there are other underlying issues that are causing the nitrates to increase??
Quote:
Originally Posted by moppy
Is there a need to change your sand bed every so often? Just curious as I've never done it but my nitrates have been slowly creeping up...
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