I believe that tank is about 6 U.S. Gallons. I suggest you read about the nitrogen cycle, as it is extremely important.
Here is my generic "Newbie" post:
Have you decided if you want a Fish Only, Fish only with live rock, or a reef?
IMO a Saltwater tank without Live Rock will be a disaster since you are a beginner.
Every Saltwater tank need the following:
Good Filter
Sand
Live Rock
Heater
Lighting
Refractometer
Test Kits
Aquarium Salt/ Pre made water
Ro/Di Unit
Powerheada.
Now to explaining each item
Filter- You can either make a sump or just use your HOB filter. What filter do you have on the aquarium? A refugium allows for extra biological filtration.
Sand- Buy dry sand, it becomes live anyway, and it's cheaper.
Live Rock- Normally you get 1-2 pounds per gallon. This will provide places to set coral and hiding places for fish and your CUC. It is also the housing for your Beneficial Bacter, which is what your biological filtration comes from.
Heater- This will provide the appropriate temperature for livestock.
Lighting- This is where you must decide if you want to keep corals or not. The three main options are T5, Metal Halide, and LED.
More info to come when you give me more info.
Refractometer: This will tell the salinity of your tank. NEVER get a swing arm hydrometer! THEY DON"T WORK! TRUST ME!!!!!!! Here is the refractometer I got and it works great:
http://www.ebay.com/itm/Salinity-Ref...item4ab33c430d
It got to my house fast and early.
Test Kits: Get test kits for: Ammonia, Nitrite, Nitrate, PH, Alkalinity Phosphates. For a reef tank add: Calcium, Magnesium, and maybe iodide.
Don't ever buy test strips, they are unreliable. Invest in quality kits such as: Salifert, Red Sea, Sea Chem, Elos, Hannah Checkers, etc.
API will not do much good for a reef.
Aquarium Salt: You have two options. Buy a bagged reef salt, this is the better option and will require an RO/DI unit. You can also buy if from an LFS, but it can contain bad elements, because most LFS only want a sale.
RO/DI Unit- This will filter the water needed for making saltwater and top offs.
Powerheads- These will provide flow for you tank. Aim for 20-50 times your tank size.
Now some people recommend getting a protein skimmer but if you are good with water changes then don't worry about it. You can always add one if you need one.
Just in case you don't know anything about cycling:
http://www.saltwateraquarium.com/cyc...water-aquarium
If you have any other questions just ask! The only stupid question is the one you don't ask! Happy Reefing and Welcome to the Salty Side!