So yesterday I picked up a used 75 with overflow and plumbing on the cheap. I was then shown a large tub full of pukani Rock sitting in bleach water. Rock was clean, nice off white color. Looks like it would fill the 75. I offered him 50.00 and he said ok. Question is, I will be starting the tank as new and need to know what it will take to get the bleach out of the rock making it safe to start a new tank.
