Your off to a great start. I really love your stand and light fixture. Maybe you can run the lights power cord along the doors trim so that it's not hanging behind the tank?
To me the large rock in the front left feels out of place and obstructive. Since it's so large in the front and maybe because it looks different than the others, my eyes are
naturally drawn to focus on it instead of the overall beauty. Another small concern I have is that the 2 smaller rocks will become completely hidden once the DHG fills in.
I look forward to seeing the Manzi in place and how it all turns out. Best of luck!