A tank that is meant to look good, however you do it.
For me, a show tank needs the following.
The equipment should be hidden or if not, organized and unobtrusive.
The tank needs to be clean.
In most cases, a background of some sort is necessary.
The viewing window needs to be cleaned regularly and not be terribly scratched.
If there is aquascaping, it should be done well and scaled to the tank size.
If there is no aquascaping the tank bottom needs to be extra clean.
The stand needs to be finished.
If there is no hood it needs to have a good-looking light fixture.
The fish need to stand out - maybe it's just me, but a beautiful tank that you have to search to see the fish is boring.
For me, a show tank needs the following.
The equipment should be hidden or if not, organized and unobtrusive.
The tank needs to be clean.
In most cases, a background of some sort is necessary.
The viewing window needs to be cleaned regularly and not be terribly scratched.
If there is aquascaping, it should be done well and scaled to the tank size.
If there is no aquascaping the tank bottom needs to be extra clean.
The stand needs to be finished.
If there is no hood it needs to have a good-looking light fixture.
The fish need to stand out - maybe it's just me, but a beautiful tank that you have to search to see the fish is boring.