I've used this kind of rocks before with my old tank but just wanted to get some opinions of preparing them before I put them in the tank. I've rinsed them before and just let them air dry before I placed them inside the tank. I've read somewhere that it is better to let them run on some saltwater with powerhead and heater for a few weeks or so. Is this necessary? I'll be using RO water when I rinse them. Thanks!