05-10-2012, 09:39 AM
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I see jennesque pulled me into this
so I'll add my thoughts. As AD said, even/odd generally doesn't matter. However, if you are dealing with some fish species in low numbers, say below 6, it can make a difference in the issue of hierarchy that jennesque mentioned.
The ratio of male/female is often of more importance than the total number. Livebearers for instance should have 2-3 females per each male, and some characins are like this. Depends upon the species. Some of the Apistogramma dwarf cichlids are harem fish with the same ratio.
Aside from the above concerns, I myself prefer odd numbers for no other reason than perception. Three or five flowers in a vase look better than 2 or 4. It is very doubtful that I can actually see this in a group of 14 or 15 tetra, but I think
it when I buy them.