I started off 4-5 years ago using the BRS recommended amount of carbon.
I scaled it back to only 100ml for my 115g system.
Lately I've not been using any. My water is staying clear with a large sock, nitrogen dosing, and very little to no use of GFO.
Still tweaking the nitrogen addition, but haven't used carbon in at least 2-3 months.
My tank is mixed corals.
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