8.52cm - 3.4inchThis is huge. What is the window thickness?
It's coming together nicely. I like your concept of bonnethead sharks as the main species with some schooling dithers. Less is definitely more here.
The tank dimensions are odd, was this due to house plan constraints? Hopefully you aren't wishing the tank should be bigger....
Very interested in your filtration if you could elaborate. Will you have a quarrantine area or sizeable hospital tank too?