I have a Rectangular 120 gallon fish tank that i have oscars in.I am moving them to a 200gallon tank soon and would like to make it into a saltwater tank.What equipment will i need to do this?Could you please give it to me in lamens terms. I want to have live rock in my tank as well.Is there anything else i would need to keep them healthy and alive.How many fish do you think I will be able to keep in there and still keep the fish happy?Will all fish attack the live rock