Whats overstocked fish tank mean?

[switchfootfan5]

1. How is a tank determined to be overstocked?
2. What does this mean in terms of fish waste/oxygen levels?
3. If you have an overstocked tank, how do you give your fish optimum health? Just more frequent water changes?
4. Is life span shortened in overstocked tanks?
5. Can there be physical evidence of "stressed" fish from overstocking? If so, like what?
6. What are the worst results of an overstocked tank?

Thanks

 

[jimg]

more room the Better.

thats all you need to know.