When you use the calculator on BRS it says that you could potentially raise it 1.4 a day. Personally I think that's a bit dangerous and would work on raising it over a week to your desired range. A lot of reefers run 8-8.5ish with some definitely running higher. You also have to be sure to add it to a high flow are or you will get build up. I use the BRS calculator to get a rough estimate on mL and then test daily and continue to adjust from there.