Excellent advice. There is a following of people who have this spacing and the (Japanese) names and the purposes of the stones perfect. Quite an art form which can replicated within the guidelines.Use an odd number of stones, try a couple more configurations with with large stone in the back a little more move it so that it is either 1/3 to the left or the right. The height of the main stone should be around 2/3 the height of the tank to hit one of the golden mean points in the aquarium. Try sloping the substrate with either the higher point being against the back wall of the tank or one corner sloped downward to the opposite corner. Take your time with planning the hardscape as this is the foundation of your tank. When you like something leave it for 2 days and see if you still like it or need to go back to the drawing board. Learn from my mistakes as it is very time consuming to redo a hardscape when you have plants and animals in there! Best of luck!