Hi everyone! We were cleaning out our basement and I stumbled across a rock collection I had when I was a kid. They're not anything fancy, just little bits of amethyst and quartz and whatnot. Most of it came from those little kiosk things in some tourist shops where you could fill up a bag with rocks. I was wondering if I could use them in my aquariums, because otherwise I don't have much use for them. Aquarium safe, or no? And if they are, would it be alright to boil them to clean them?