Like I said, only bleach if you're going to soak and boil, soaking being in a very SeaChem Prime-laden water. Yes, bleach is evil to an aquarium, but several bags I once used to clear up my water were recharged with bleach, so I know it can be safely used if you soak items several times before placing back into the tank. And bleach is what is used on all those ivory-white dead corals for sale to be placed in aquariums.