I am looking to start a 55 gallon tank with soft beginner corals like mushrooms and some beginner fish i.e. clown fish. I am confused on how filtration works for salt water aquariums. What exactly will i need for a filtration system? From my understanding is i will need live rock and a protein skimmer and adequate work flow, as well as weekly water changes in order for my aquarium to run properly. If anyone can just clarify this for me it would be greatly appreciated. Thank you.