Cleaning Rock before placing in the tank
I picked up a few nice pieces of rock at a creek. a few look like tumbled basalt, but the others were pieces of a softer rock of some sort that was shattered in jagged pieces and has cracks and uneven surface.
I scrubbed them with a tough brush and tossed in a bucket with some bleach to kill algae on the outside. what else should I do? Boil or bake them?