I hate the "Black" topfin stuff. It's painted with some kind of metallic grey and it wears off. I washed it 3 times before adding it to my tank, and it still rubbed off on my Corys, and it was all over the filter floss. I'm scared to disturb it half the time for fear it will turn my water metallic again...
so, long story short, if the bag isn't opened, return it.
so, long story short, if the bag isn't opened, return it.