Originally Posted by Halamaya
I em no expert but it removes impurities from the water like NITRATES. I don't beleive it filters out enough of your trace elemnts to matter.
Its not a nitrate remover however it does aid in eliminating impurities that may be present in your tank, also any toxins that might be given off by anemones or corals.
Its recomended to run carbon in 2 week intervals I have read that over using can actually take away from some essential nurtrients in your tank. I run mine for 2 weeks and then nothing for 2 weeks, and start all over again.