06-22-2012, 11:52 AM
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Originally Posted by Varkolak
I've heard that fish always want to school in odd numbers and that they will kill an even to create odds, I had 10 rasboras but it seems 1 has died on me, my pet store offers a 2 week guarantee on all freshwater fish so I can always replace him or get store credit for a different fish or product. Also I'd like to note that these little guys are perfectly content not schooling, they manage to take up half my tank in a big mess of darting fishies. lol oh well at least they seem happy and every once in awhile they will group up for me
Even or odd numbers rarely matter. It is with smaller numbers that this can be an issue, for instance if you have 2 or 3 angelfish there is more chance one will bully the other one/two to death, whereas in a group of 5 or 6 this is less likely as the normal aggression is spread around. And sometimes with certain species you want more males, or conversely more females, for reasons of natural behaviours. But aside from these cases, 9 or 10 or 11 fish in a group makes no difference.
"Schooling" really doesn't occur with freshwater fish. They shoal, which means they need a group, though some species will remain closer than others. Generally speaking, the rasbora in Trigonostigma tend to remain close together, mid-water level. The larger the tank the more this occurs. I happened to be at the Vancouver Aquarium yesterday, and in one display that must be close to 1000 gallons, there are shoals of Lemon Tetra, Red Eye Tetra and Penguin Tetra. Now in the average largish home aquarium, of say 4 or even 5 feet length, these species would most likely mix. But in this display they remain in very tight shoals, and swim together. Reason is simply the space; they are in a much more natural environment in this display tank, and that causes them to act naturally as they would in their habitat.