I do the same prosses with my rocks. After leting them set over night I rince them off 4-5 times with the hotest posibale watter I can stand the refill the pail with a declornator I use in the tank when I do watter changes and let that agen sit over night then rince a few times agen and they are good to go. I have never have a problem with my fish doing it this way.