08-26-2011, 01:05 PM
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I would not recommend a nippy fish like Tiger Barb in with a knifefish. The wavy long fins are very likely to get nipped. This will highly stress the knifefish.
This fish attains 2 feet, and being stiff-bodies requires a very wide and long tank, at least a 3 foot front to back and 6+ feet long. We are talking very large. Otherwise it will be unable to turn around.
Tankmates need to be peaceful, as this fish is shy, but not too small to be eaten (it is a predator). And it need very , very dim light, as it is nocturnal by nature and will be stressed in a brightly-lit tank.