I'm going to be starting a 180 gallon build as soon as I get back from vacation at the end of the month. I'm going to buy 200 pounds of rock from Billy's reef connection and 200 pounds of dry aragonite sand. Could I start soaking it in town tap water? Then when i get closer to using it, soaking in RO/DI water. I have a RO/DI system but I hate to waste that water when I'm going to be changing it often. Thanks in advance.