Goat585 - I am in the process of building out almost the exact same set up for a leather coral dominated reef.
This was also my first time using Carib Seas indo sand but in the past week I have come to appreciate that diatom are not as noticeable as they are on white sand. I will post a few pics for reference.
My rock is 'live' but new (= no coraline algae), but the little bit of coarline that came over with the coral's rock really stand out.
So far I like the indo sand look, but did add a few bags of the all black version to darken it up a little more.
Good luck with your build - looks good so far. Good luck!
Here are a few pics (please excuse the unhappy toadstool. He is still getting over acclimating from T5s to LED.
View attachment 24799
View attachment 24800