I had a blacktip. If you search my username on YouTube you'll find a couple videos. Rounded corners was not necessary. The first 30-40 minutes he was bumping the glass but once he was familiar with the tank it was no longer an issue. You can see in the swim patterns that he was aware of his surrounding. I did keep minimal rock in the display (probably 500-600lbs) which helped.
Please don't take offense but you might not realize what you are getting yourself into based on some of the questions you are asking.
I ordered 14 buckets of IO just to fill the tank, a full bucket of IO was only a 10% water change for my tank. You have to resist the urge to feed daily or every time you have company. You have to source vitamins through companies that supply zoos and aquariums. My electric bill went up substantially, as did my water bill. Everything in my garage began to rust and it lowered the foundation of my home about 2 inches in the garage, which was visible on the second story roof line. I had a structural engineer review the blueprints for the stand I had built to accommodate for the very mild slope of the garage and also evenly distribute the weight. It still cracked the foundation in the garage terribly.
He was a model citizen for months and then started eating fish. Tangs, Rays and a golden puffer. He spent a very long time in the tank after that as the only animal except for a couple aggressive fish. The only thing that were safe were a 48" eel, a basketball sized lion, and a 24" banded cat shark.
I kept him for quite a long time, but my neighborhood had taken a turn for the worse when the housing bubble burst and I no longer felt safe parking my car outside. I moved the shark to a much larger system, drained the tank and sold everything for $2,000. Yes 2,000 for the tank, stand, pumps, plumbing and sump. I had a guy drive over from two states away to pick it up. LOTS AND LOTS AND LOTS of people wanted it, but the reality of having to financially maintain the system makes it more of a commitment that most are willing to make. It took so long to sell the tank, I actually considered breaking it up with a sledge so that I could haul it to the dump as I desperately needed my garage space back.
As for the shark, when I turned him over to his new owners I thought that they were caring and qualified. I told them that if they ever had an issue with Cupcake they could call me for help. Sadly, they chose to feed him with a thin wooden dowl which he broke in half and partially swallowed. They allowed him to swim with it sticking out of his mouth until he died a few weeks later. I never received a call, and if I had I would have gladly gone into the tank and removed the stick. I had gotten into the tank with him many times before.