That much water exerts a lot of pressure and I know they use a special sealant and then there is the thickness of the glass needed to achieve this. I would contact some aquarium builders and see if they are willing to share some of their building techniques.
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Hi Candy,
At first this is nearly impossible and go out and buy one, but here are 2 references for you on the how to's.
https://forums.saltwaterfish.com/index.php?threads/how-to-build-a-200g-glass-aquarium.19
https://www.aquaticplantcentral.com/forumapc/diy-aquarium-projects/81816-my-200
Best to you
https://www.youtube.com/watch?v=dp37Tzb0fy4
https://www.youtube.com/watch?v=pqxcarWSmiA
https://www.google.com/search?q=diy+200+gallon+fish+tank&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwitoOGQnvfcAhVCZawKHdW0BLEQsAR6BAgCEAE&biw=1536&bih=739
That much water exerts a lot of pressure and I know they use a special sealant and then there is the thickness of the glass needed to achieve this. I would contact some aquarium builders and see if they are willing to share some of their building techniques.
Here is a 6pt. video on YouTube.... https://www.youtube.com/watch?v=XHKIWrQVicU