Yeah, you've got me thinking ... it would take up a lot of space, but I could make a 84x30x30 work. 310 gallons. That would be sweet. Glass would weigh 550 pounds total, but no panel would be more than about 150 pounds.
But seriously... my wife would think I lost my mind. And she'd probably be right. I can't imagine the conversation ... "Honey, I'm ordering several thousand dollars of glass panels weighing 550 pounds, and I'm going to assemble them into a 7 foot aquarium in the basement. Oh, and once it's done, it won't fit back out the door. No, seriously, it'll be fine."
No, I probably can't do this lol. At least not right now.
Its not that crazy. If elon musk proposed the idea people would throw money at him and say he was a genius lol.
But 30" should squeeze through most doorways if you remove the door and hinges.