You are going to have a 'sand storn' after adding your sw
to the tank. That is normal and will clear up while the tank cycles.
So, mix the salt into a water containter until it reads around 1.028 at 75-80 degrees.
Add this sw
mix to the tank.
Continue until the tank is 3/4 full.
Add your rock and aquascape
Add enough RODI
water to get the SG
down to 1.024-1.025
If you need more water to fill the tank, mix some RODI
with enough salt mix to get the batch to 1.025 and add that to the tank.
Continue until the tank is full
You should be using a refarctometer to test the SG
of the water.
How are you going to cylce the tank?
Are you getting uncured LR
Do you plan on using the cocktail shrimp method?