Currently have a saltwater tank and because I live in Hawaii, I cant have all the live rock and coral that are required by saltwater tanks and I am thinking of switching over to a freshwater tank. My question is what should I be considering for mainting to get this tank started. I already have a Emperor 400, but is there anything else that I should be using. I also will be using RO/DI water to fill the tank. But what else do I need to consider. Please help!!!