After a long weeknd. The tank is filled. I started by pitting the rock in. I had a hard time getting the sand in after that. The center brace and getting the sand under the rocks. So I pulled it out and started over. I like the first layout better.
I put the sand in first the second time, then rock. I filled the tank via the sump. The heads were over the rocks. I did not get a sand storm.
My water readings are great. I will take a few weeks to see how the rock progresses.