I have no idea where you are getting the idea that the REDSEA aquarium seal’s fail. They are solid. They don’t miter the corners for one. Depending on how large of the aquarium that you purchase, the glass is thick and has quartz in it for the best visibility. My 50 gallon has 10mm glass. It’s basically a cube and one of the best aquariums I have ever owned. The other really cool aquarium I had was a Starfire 120 gallon w/8mm glass. It was a beautiful tank. It had clear silicone mitered corners and I was way more worried about that one than the RedSea.
The issue comes when people put water in them and drain them and let them sit. The seals dry out over time. I would buy a REDSEA time and time again. I was just trying to tell you my experience. You will dugout what is best for you. With the REDSEA, the plumbing is in place, the cabinet is accessible and convenient. The display tank is remarkably clear and beautiful. It’s a great environment, for sure. Best of luck to you Reefing…! JL