This article is from the Aquaria: Good (and Bad) First Fish; Breeding FAQ, by Dean Hougen and Elaine Thompson
There are thousands of species of aquarium-suitable fish from a host
of families that are not covered above; this article is far from
comprehensive. Killifish (fish of the family Cyprinodontidae) for
example, are widely kept by many advanced hobbyists, but not often by
beginners. This is not because they are all unsuitable as beginner's
fish. In fact, some of them would make very good first or second fish.
They are simply not widely available in pet stores.
For choices of good beginners' fish beyond those listed here, and for
expanding once one has moved beyond the beginner level, local aquarium
clubs and friends who are aquarists can be very good sources of
information. So can many of the available fishkeeping books and
magazines. At every level of experience, the aquarist will find that
good information is well worth the time and/or money it takes to get
it.
 
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