Hi guys I just bought a sack of lava rock from the local nursery. I called the manufacturer and they told me that they don't treat it with any chemicals or dye. The lava is about 1/2" to 3/4" in size, and it looks like it's been tumbled to kind of round off the corners. what should I do to prepare it for my new hydro system? The only info I can find on using lava is from aquarium sites and nearly all of the posts say to boil it in plain water prior to use. I'm not sure why that is--maybe to kill bacteria that could hurt the fish? Do you think I would need to boil it? Or give it a good water soak/rinse? Maybe hit it with a little peroxide? Thanks for any info.