Hello! I've been stalking this site for a couple years now, I am about to start a thread with my journey to setting up my fish tank for an Octopus, but I have an immediate question I wasn't sure about. I am using some store bought regular sand for the tank. More specific I am using Quikrete Play sand. I was just about to begin the process of rinsing the sand and it struck me I would be rinsing it with my hose outside. Has anyone used regular sand like this? And should I just take my time and rinse and clean it with RO water instead of using tap water? Or would it be safe to rinse with tap water? I know it may sound like a silly question, but I don't want to ruin everything because I rinsed the sand with water that could contaminate the tank with metals. Thanks guys!