01-11-2010, 08:44 PM
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My experience has shown that having 3 of each species seems to work. I have five cory species in my current 90g and eight species in my 115g, plus an Aspidoras species in each (same family). I have varying numbers due to what has been available, so some species have 2, most have 3, and a couple have 5 or 6. Some stay together much more than others; C. panda are always together and I can't think when I've seen one of them with any other species. But different fish will do different things.
In their natural habitats in Amazonia, species are often found intermingled, but always there are large numbers of each species within that mixed species group. I would take that as a guide and aim for 3 or more of each species, while combining them. A happy fish is a healthier fish.