Channa andrao

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Leftovers will usually be fine in their own tank, since the chances of having two couples out of a batch are really, REALLY slim. ;)

The bigger tank the better, of course, they remain Channas, whom don't like each other very much. ;)
 
Yes very good chance the others could be killed in the pairing process.

In my experience you'll have the best chance of pairing with male heavy groups of 5-6 Channa . 3-4 males & 2 females.
 
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