I'm trying some now, could be snake oil but on a new set up, put about a gallon of the CaribSea Mineral Mud in the fuge. Saw immediate action from the pods, all that was in there was some cheato, I had not noticed that many bugs crawing/swimming around before. Make up seems good, fine silt and fine sand. Will use some for my shaveing brushes when I move them over, since they like aged substrate.