I am probably going to ditch the coco fiber. I noticed a piece in my BP's mouth last night when I took her out of her tank. I figure that it is probably not harmful, but I don't see why to let it happen.. she did a yawning motion while I had her out, and I was able to get it out with my finger. It was small, about the size of a pencil shaving, but still not 100% happy that it happened :/