10 percent a week is perfect , for you total volume. what salt do you use? what kind of livestock do you plan to keep? Do you plan to dose? If you dont dose, I recommend a salt with high calcium such as Reef Crystals , if you plan to keep corals. and dont plan to dose, but you'll religiously do your water changes weekly.
A lot depends on the bio load also and the skimmer.. i change 10% every 7-10 days and i only have 2 small fish and a cleanup crew feed them every other day.. corals are another story i have too many which is y i bought a larger tank :splitspin never had to dose anything.. i stopped testing my parameters also because everytime i did the numbers were basically the same..