No smell or your used to it? there is a difference, there is also a difference between no BAD smell and no smell.
In the end its one thing to say to the OP that carbon has limited use, such as removing medication, removing odder, or in making the use of ozone or denitrate filter safer. But to just simply say its useless is without merit. when it clearly has uses, and if you took a stranger to your house asked them to stick their nose over the tank and ask them if they smell something the answer will be yes.