I put a mirror up for my fish as well when I added my CBB to DT. Made a huge difference for agression.
My CBB is fat and happy now!! He is a beast going after food in open water. Doesn’t fit the profile haha!
Looks great. How often and what do you feed him? I purchased one of those special CBB feeders but he doesn't seem interested. Was thinking of slivering some clam and have a few poke through the holes.