Swordtail

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Tommy10

Aquarium Advice FINatic
Joined
Nov 27, 2013
Messages
532
First off i know this is the wrong section but I'm not getting any answers in unhealthy fish so I came here. My red swordtail's sword is black, i just noticed this today. He is swimming normal as are all other fish. All other fish are fine and my levels are good. Please help! Thanks
 
It wasn't black before in the last month I've had him, is it possible that this is just natural colouring?
 
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