I change once a month. However, I think it might vary depending on if you use carbon in a reactor or in a bag.
I just have a bag hanging in my sump and my thinking is that rate of flow through it is lower so once a month is fine. If I had a reactor, I might rethink that.
I haven't entirely convinced myself this thinking makes sense yet though !
Interestingly enough, if you read what the carbon people say, they say to only use carbon intermittently in a marine tank. I think 99%+ of people here run it full time.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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