For me how "stocked" a tank is depends on several factors- filtration, plants/no plants, long term/short term housing (and current fish size), water volume and of course - the fish. There is no dividing line between over/under stocking, just a blended area... if your in that area, chances are your still fine though.
But, for my own tanks... I tend to go with as few fish as I can, and usually use other critters to make the tank intresting.
But, for my own tanks... I tend to go with as few fish as I can, and usually use other critters to make the tank intresting.