Are those Quality Marine Eco Rocks? If they are, let me tell you, they are awesome. I won a box of these rocks at the Socal coral show raffle. Coralline loves these rocks because it is so porous. All of my real rocks...almost no coralline. The QM rocks, holy cow, it is fully covered. The rocks are literally next to each other in the same tank. I am shocked that it's that huge of difference.