Neon tetras are very sensitive to water conditions, aviod these as a starter. A goldfish is never ok for such a small tank even a small goldfish is not ok because a healthy goldie will grow 4-6 inches in a year. You could get female bettas, a few different colours. Three for a 6 gallon or 5 for a twelve gallon. They form a hierarchy and are very interesting to watch.
http://www.bettadreams.com/ricepaddies.html
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