I just received a 2 liter tub of Matrix from a friend, and I'm wondering if anyone has any experience with this stuff being used in a reef sump. Should it be run pre or post skimmer, used in the fuge as rubble, or could I place it all under my skimmer stand? I have thought about adding Marinepur blocks in the past, just for some extra bio filtration, but never really pursued it. I would not want to start another cycle either. Any thoughts?



