Does carbon bleach your corals ? (Kent carbon recall)

[christyf5]

polyfilter will remove it from the water as it leaches from your rock, however if your rock keeps leaching without the polyfilter, you'll always have it in your water. I guess it also depends on what kind of levels were in the water in the first place and whether it was taken up by the rock. The polyfilter might let you know what is in the water also, as it changes color depending on what it is removing.