08-05-2012, 03:52 PM
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I would agree on five being minimum for most corys, but not the "dwarf" species. These definitely do much better with higher numbers, and in a 10g you could have 9 which is the minimum I would aim for.
There are actually several cory species that remain quite small, although the three most commonly talked about are Corydoras pygmaeus, Corydoras hastatus, and Corydoras habrosus. The latter is almost not a "dwarf" as it does get a bit larger than the other two mentioned. I have, or have had, all three. They tend to be very delicate; as to which is less so, hard to say. I have not been able to get C. hastatus for many years, and from my experiences with the other two lately I don't know that either is hardier than the other.
A professional catfish importer/breeder advised me that they must have sand, and I will admit that since changing to sand they have lived longer. They also do not like high temperatures as in general community tanks. Dr. Neale Monks has said never above 75F, and I now have my C. pygmaeus and C. habrosus at this temp.
You can click the shaded names, as all three are in our profiles. At some point i shall likely add some of the other "dwarfs" although they are much less common in the hobby.