I didn't run carbon, was told and read that it can remove a lot of your trace elements etc. Some carbons contain phosphates and will leach them into your system. If you leave the carbon in to long it will eventually start to leach out the nasties it removed. I've use Chemi pure and was very happy with it and I'll stick with it.
That being said it does seem to do a lot of good in some peoples tanks so as the saying goes, some say tomato some say tomato.. (doesn't work in type).
Doug
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