Nitrate!

sounds like not a problem - see what your tap water reading is and act on that.
 
its gone up to 40ppm what to do? i am cleaning my canister 2moz
 
dont over clean the filter - just rinse 1 3rd of the media lightly in tank water. Wait a week then rinse another 3rd.

50% - 60% w/c - job done.
 

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