Custom Aquariums (GLASS ONLY) all day, every day. They have an online configuration tool where you can 'make your own dimensions.' Top notch communication and service. They also have retailers at pet stores (check your area) that can deliver or help setup if needed.
They also tell you what the actual gallons and model gallons are. For example a 125 is really around 117. To get 125 real gallons you would have to go larger than standard size.
They have all kinds of filtration systems, stands, etc. Marine grade steel frames on their glass tanks. I could dance on my 225 and not bust a thing. You can choose regular or starfire glass, annealed or tempered. Here's a trick...if you go tempered you can reduce thickness and add volume without going larger. My 225 is 1/2" tempered on the sides, regular on the bottom. On the same footprint I gained back gallons. If I went with regular glass all around the walls would have to be 3/4". You can pick from multiple backgrounds, high grade print with white backing. Or send them a picture of your choosing.
go here:
Custom Aquariums, Glass Fish Tanks, DIY Aquariums, Saltwater Aquariums
Custom Aquarium Configurator (customaquariums.com)
make any shape you want. Hexagon, pentagon , corner, shallow, square. Personally I always wanted a big shallow hex...always annoyed me the standard ones are always tall.
For big acrylic:
Aquariums & Fish Tanks For Sale - Acrylic, Saltwater, Freshwater – Dream Fish Tanks
OR
Fish Tanks Direct | Buy Freshwater & Saltwater Aquariums
they even have bullnose tanks!
