A thousand gallon tanks, hmmm 8) ... Any idea when approximately that dream might come true? LOL

Man, don't we all wish for tanks like that! I can't believe you're already planning what they will be stocked with, haha
As for the first tank, I am not even counting inches and body masses of fish, lol, I am sure a 1000 gallon tank will be enough! But, Silver Dollars do not mix with Angelfish.
If I had a few 1000 gallon tanks, I'd get loads of Rainbows of all kinds and sizes for one of them; for the next one: a good number of Rams plus many gigantic shoals of small fish such as Diamond Tetras, Buenos Aires Tetras, Zebra Danios, Cherry Barbs, Harlequin Rasboras, Cardinal Tetras, Glass Catfish, and many more ... For the third one, I'd get Discus only. And for the last one, I'd get Angelfish only. Of course, all these enormous tanks would be extremely planted, looking like wild jungles! Ahhh ... if that dream only came true ...