Is your ghost knife still a baby?
It will stop nipping when it grows because it will eat the whole fish instead...
Sorry, knifes are not good community fish. They do get territorial and are predatory...
The only safe way to prevent the knife from nipping fins of its tankmates and later eating them is to separate them...
Of course, the above assumes your knife's tankmates are not other knives and smaller fish...![]()
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