I appreciate all your ideas.
I put some of the rock in the tank to see how it looked. The tank is much more limiting then playing with the rock on the carpet. Plus the water magnifies things a bit (I think 25%) so now I have to reduce the depth of the rock terain a bit as I want lots of open space in the front of the tank.
Good thing I got the 30" depth instead of 24" otherwise I would be really limited since many of the rock pieces are fairly large.
Tank is about 1/3 full of RO/Di water. It should be full by Sunday and then comes the first system test.
Also, so far, no leaks or spills on the tank, sump and plumbing.