Social Behavior
This fish does well when kept in small groups when young, although as it ages, will become somewhat aggressive towards those of its own kind. The African knife should not be thought as aggressive as other knife fish, such as the black ghost, and can coexist with those of its kind into old age when allowed about 75 gallons per knife. And unlike that of the Black Ghost Knife, the African Knife will accept flake food, especially when there are other knives present to compete with.
Read more about this topic: Xenomystus Nigri
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