2 Kessil 150s are not going to be enough light for an anemone or SPS. LPS and softies will do fine. You'd need 2 more minimum. I run A360we and still need to supplement with T5s until I can get at least one more to keep anemones and SPS.
You want your SG to be closer to 1.026. Not important for fish but speaks don't like low salinity.
As far as additives. I don't like reef fusion because it is dosed based on a certain amount per week. I like the two part (it is really 3 parts). You have a known concentration of the 3 additives in 3 bottles. First thing you need to bring your salinity up then test the parameters. The salinity will affect them.
Using your new Ca2+, Mg2+, and Alk You first need to bring up magnesium. That is important. I target 1350. Once that is correct I like to increase calcium and Alk together a little every day until you are on target. I noticed I was wrong about your Alk and it is high not low. Just bring calcium up to 420-450 and leave Alk alone. Alk should be 8-9. Another nice thing about two part is there are online calculators where you put in volume, your current level and target level and they tell you how much to add.