My black ghost knife fish

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Hi, i have resently bought a black ghost knife fish. he is really really cool. and i know that they are nocturnal so i got him a decoration whish is a sunken ship, i got it for him because it is very dark in there. but today when he finally came out i noticed his left fin was cut, so i am wondering if it can heal. thank you for reading and if you want to know where to buy 1 of these amazing fish ask me and i can tell you. agin thank you for reading