Hello My name is Maria Riley and I live around Louisville, KY. I just bought two bettas today for a 5 gallon tank but also have a 10 gallon tank that I want to start a small saltwater tank with. I know this is now an ideal aquarium size however I have to work with what I have. Since I am new I have a lot of question. Would just any 10 gallon filter work? I bought an Air Pump so do I still need a circulation pump? I watched a video that showed a man who started a 10 gallon tank and only used a hang on the back filter, crushed coral, LED light, 50 watt heater, circulation pump and dry and life rock and he was able to keep his tank clean with doing weekly changes about 50%. He said in his filter he used a chemi pure blue and a poly filter pad and that was it. He also talked about topping off with RO water...What is that? I Guess what I am trying to say is what all is required to start a 10 gallon tank and what do you recommend? I want to do a few corals and a clown fish or two. Thoughts?