Just tested a cup of tap water and it came in at 162ppm.

I already have 30g produced so i think i'll continue to use the 2ppm....

it cant hurt and the extra time i leave it mixing with the salt will probably be good for it....

Do you plan to not let the tank cycle or some time?

Yes,

I'm transferring the contents of my 30 gallon tank which also has cured rock.

i just meant that i have a 30 g mixing tank and the day it takes to produce another 30 g of ro gives my first batch more time to mix....

i already put new live sand in the 90 so i'm mixing my salt then adding it to the 90 g slowly.

i plan on moving half the rock over and then letting it cycle.