Using Carbon to Polish Water

[sobe]

I use a small mesh bag of granular sized activated carbon just under where my drain empties to the sump. I notice the water is clearer and doesn't have much of that fishy water smell. My 110 is running about close to 6 years now.. I have a yellow tang that is 11 years old doesn't have hlle that came from my old tank. As some people said gac can be a culprit in this disease in tangs

I just the fluval brand bulk gac, it rinses good, and price compared to other gac is good, I replace it every month I'd say about 1/2 to 3/4 of a cup in a mesh bag I use