It's safe to say that mass produced tanks come in standard dimensions where the length is proportionate to width and height. Actually you can get a 8 foot long tank that 24x24 (LxW). I've never seen a tank that is for example taller than wider and here is the point of my post. I wonder if the reason is the depth of streams and lakes where these fresh water fish come from? Still, you have fish, that are classified based on their primary zone of habitation such as bottom dwellers, mid range swimmer, and top swimmer. I've also knows that for some species of fish like Discus or Angels you should have a "taller" tank. With this intro in mind, I'd like to see if anyone has expertise and would like to share their view on larger tanks that are taller in proportions to their lengths. I just think an 8 foot long tank and 24x24 high/wide is too long and is aesthetically not pleasing a standard living room that's maybe 12x20 feet. I want a large fresh water tank of at least 200 gallons (or similar) with Angel as my specimen breed, and other community fish that's not more than 5 foot long and whatever the rest of the dimensions may it take. I would imagine that the natural environment that most of these fish live would be deeper than 2 or 3 feet. Thanks for reading my post!