That is a bit of a myth in my opinion, in reality if you stock sensibly and keep up you water changes small tanks are fine.
If your putting it on your desk, I suggest you get something that looks nice and doesnt have a nasty plastic hood like a Fluval Edge.
Stocking wise as others have said, I would get one type of fish and just be sensible with the numbers/size.
Without wishing to sound big headed, I'm a fairly experienced keeper of fish, but thanks anyway, I'll bear in mind your note about the Fluval Edge. Hope that doesn't come across rude.

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