Hate to be the bearer of bad news, but 1 gallon of water weights 10 lbs, meaning a 20 gallon aquarium weighs 200 lbs. You're 810 gallon aquarium would weigh over 4 tons, and that would surely cripple the foundation of your house x.x picture 4 small cars just chilling in there... Then add all those other aquariums, the weight would be enormous.
Even if the 4 tons wasn't an issue, the size of such a tank would be massive, especially if there are several 500 gallon tanks to accompany it.
I'd love to see these pictures, not because I don't beleive you, because I have seen some fish enthusiasts who do have tanks of this size (they usually keep them somewhere public, though, not in their houses) I've just never heard of so many in the same room.