lol I have a little of everything in my sand. From tanks through the past years. You are the artist. Make your creation.
Just remember you put stress on your critters and tank system if you remove everything and start over.
If you are looking to add some fine sand to the top of your sand that would be great. And it will show off the other colors in the tank.
Just put a small layer on top of your existing sand to add color dont take it all down. just my thoughts
Just put the black sand around your rocks. You dont need to move the LR.