Hi, I just bought a 75g tank and am planning to make it a fish/live rock aquarium. I am new to this, and after doing some research I realize that this will be a big commitment. I am looking for advice on what types of filters, heaters, protein skimmers, etc that I will need. Is it better to use sand or crushed gravel, basically the things that you experienced folk have learned over the years with this hobby. Any recommendations that you can give me would be appreciated!