Just a little update.......very little since it's still early, and only have my first 2 cups of joe in me.
Did my first 4 MONTH ('whether it needs it of not') water change on my new system yesterday......16 gallons on my....hmmmmm...

.......no clue, but at some point figured in the ball park of 160 gallon'ish system.
I use the Atlantic Ocean with a touch of Instant Ocean.......NSW in our stretch of the Atlantic at least this recent batch was 1.018 and I run our tanks at 1.0255. So a 1/2-CUP of Reef Crystals did the trick.
Temp is running around 78.6 - 80.1 through the course of the day
SG at said 1.0255
pH at 8.4 * My steadiest parameter
dKH of 9
Will check with my other numbers today. But this is thrilling me so far after 4 months as stable and 'happy looking' the system is.
TANK #1("The one closest to Ya") is the one I keep my Fish in......best I can figure I have at least 3 in there, with possibly hmmm..

....another 2-3. A 'look down' system, overgrown in a canopy of Corals make it all but impossible to see/keep track of the tiny Gobies.
But do see our Half Black Dwarf Angel, our PJ Cardinal, and our oldest a Blue/Green Chromis are constantly interacting with me.
My newest Leather, a Tan Toadstool, which I got a couple months ago is doing good.
And another leather, a Green Umbrella Coral that was just 'holding it's own' in the 210 gallon, and is now EXPLODING!
Always enveloped in polyp extension.
Hack