Join Date: May 2011
Location: Elk Grove, California
The inch a gallon rule is a loose guideline, I actually don't use it much. And I have some aquarium books written by longtime hobbyists that have stocking options some 1 inch per gallon people would freak out at. But when you stop and think about it, a lot more goes into stocking than just space.
Temperament: aggressive fish need more space to be away from other fish.
Bioload: herbivores and omnivores have a smaller bioload than carnivores.
Schooling: schooling fish need big groups but comparatively little space because they stay together, not spread out like non-schoolers.
All that said, 6-7 black neons, 1 male betta, and 2-3 ghost shrimp sounds perfect.