Join Date: Oct 2010
Location: Victoria, Australia
While your tank size would be plenty for many of the micro species of rasbora and tetras, you are going to run into issues with your pH and alkalinity. Many smaller species that would be suitable for a 10 gallon tank, prefer neutral to soft water.
You may find a few exceptions such as the danio mentioned on the previous page, but you may also have to look at smaller cichlids such as shell-dwellers.
Some fish can tolerate water conditions that are not ideal, but others will not do so well.
A database like SeriouslyFish.com contains information on hundreds of species of fish. So perhaps trawling through there and finding something you like and that fits might be the answer.