I'm converting a 55 gal tank from freshwater to saltwater, and I need some advice in doing just that. I currently have an emperor 400 filter in use with my freshwater tank, and my first question is, will that suffice for my saltwater tank, or will I need something else/better instead? A guy at a local saltwater fish store highly recommended the Amiracle sl-5 system, which is both a filter and includes a protein skimmer. Is that a good system to use, or is there a better filter on the market? Finally, any other general advice would be appreciated in regard to simply getting the tank up and running. Thanks.