I have a 1 gallon tank on my desk at work, it is lighted, but not heated. I
had a betta in it but it died (almost 4 years old).

Besides one betta or goldfish, are their any other very small fish that I
could have one (preferabloyu two of them) in the one gallon UNHEATED tank?
Can tetras live okay without a heater... or are goldfish or a betta my only
option?