Quote Originally Posted by RayAllen View Post
Zack that is exactly what I was thinking before I thought it was some sort of algae. Hence why I mentioned using BRS carbon in my BRS Reactor. Man if that is the case that is a lot of dust! My skimmer does stay black when I use it though so that could definitely be the problem.
That'd be my first guess. I've had some carbon bags that I have had to rinse for what seemed like forever to get them to run clean. Maybe you may have put the carbon in a bit too dusty and it got on your stuff?