carbon

[angelspot]

What does carbon do for a reef tank and how do you use it?

 

[quazi]

If you need to use carbon, use PolyFilter instead. It is more efficient, changes color as it absorbs bad things, the color it changes to indicates what kind of bad things it absorbs (i.e., copper=green) and can be used in pieces.
Only use Polyfilters or carbon as needed. I only use it when I see something in my tank is unhappy. It cures a multitude of ills.