This sounds like your first venture with a marine aquarium and that you are just setting up your system, My advice to you is STOP! READ! - this and other forums. CHeck out the posted articles, ask your questions and wait for the replies.
Please do not be in a rush to start adding livestock to your new tank. I too had a FW
tank for many years before venturing into SW
. Nothing good happens quickly in a SW
tank. It takes a lot of time and patience.
Are you planning on a FO
or reef tank?