There is a lot to discuss on this. First, I would suggest that you find a conversion table and post your parameters in the units of measure most commonly discussed. This will help you avoid confusion and allow you to better understand other threads and magazines that you might read. Generally speaking, you should post ammonia, nitrite, and nitrates, and calcium as "ppm" or "parts per million". In the near future, when you begin testing for alkalinity, you should post in DKH.
As for filtration on a saltwater tank, I suggest you take some time to look at the "Pictures and Videos" section of this website. You will find many examples of successful marine aquariums. As you do, you will see that nearly all of these have one thing in common. They rely on live rock, live sand, and a protein skimmer as the method of filtration. Regardless of tank size, this method will allow you the greatest opportunity to succeed, and is BY FAR the least time consuming. Water changes will be minimal, as little as 3 to 5 gallons per MONTH.
The reason you should not be using any other form of filtration is simple. Hang on power filters, biological filters, internal mechanical and chemical filters, these all do things to the water which cause an increase in nitrates and phosphates. In a marine aquarium we are trying to eliminate nitrates and phosphates, so using a filter which INTENTIONALLY inputs these elements into the aquarium just doesn't make any sense. A protein skimmer will directly REMOVE the waste, without negative side effets.
Additionally, the long term stability of your system will depend greatly on your ability to manage the relationship between calcium, alkalinity, and pH. These levels are much easier to maintain when the organic acids (waste) are directly removed by the protein skimmer. When these acids are broken down, as occurs with other filtration methods, carbonates are removed from the buffer system, causing fluctuating calcium and alkalinity.
I strongly suggest that you replace your internal filter with an appropriate protein skimmer. We can discuss options for you if you like.