Thats because in nature, these fish would be normally be put this close together. Aquariums are really a form of nature concentration.
They may look natural, but theyre not at all.
Imagine if aliens captured a bunch of different humans - all diff ages, races, cultures, and put 20 of them in a living room, and said " ok, you guys all get along now"
well ive decided... im gonna take the whole lot but the cory cat and the rasboras back... im gonna get some tiger barbs and a few more rasboras... have a nice school of 6 or 7 tigers... that should be cool... tiger barbs are nice looking fish
My Tanks
If you put off what you can do today until tomorrow it will never get done cause tomorrow never comes. It's always today. 
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