just for clarification for the op and for others, you seem to be getting confused with using gac ( granular activated carbon) -- the black stuff we put in mesh bags or in reactors that is used to absorb impurities and toxins and keep the water clear, and carbon dosing which is adding vodka, or vinegar etc. Or bio-pellets the purpose of which is to feed bacteria that in turn metabolize po4 and no3.
When we commonly ask someone if they run carbon we mean gac -- something nearly all hobbyists do.
Carbon dosing is a more advanced technique that should be fully understood before implementing.