Hi, my RO/DI unit is coming in tomorrow, and I wanted to check with everyone real quick about a few things. First, should I be adding anything to my RO water when I use it for top-offs? Also, when I mix my own saltwater, should I add anything to the water before I add the mix. I see that Kent makes some stuff to add to marine RO water before adding salt mixes. I'll probably be using reef crystals when I mix. Is this a waist to get this stuff, or just mix the RO water with the salt mix. Thanks!