carbon

[StirCrazy]

I use Carbon in my planted tank 100% of the time, I change it out once a month, there have been studies in planted tanks to the effext it has on trce elements and it is very small, mind you the fertalizers we add replaces them right away so it might be a little more in a reef but it ou are adding stuff or doing frequent small water changers I wouldent worry about it personaly.

Steve