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Old 01-13-2017, 11:59 AM   #1
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What is this black colored fin on my Glofish Tetra?

I have this black colored fin on my Glofish tetra. It started out as a little black dot on the fin, but now it has covered the whole fin. What is this? Any help would be much appreciated. Thanks in advanced.Click image for larger version

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Old 01-14-2017, 08:00 PM   #2
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I'm wondering if this could be some natural colour (although unusual). Does the fish look otherwise healthy?

Other options are localised tumour causing colouring change or chemicals eg ammonia spike.
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Old 01-14-2017, 09:06 PM   #3
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The fish is eating and doing regular fish type stuff. If it was a ammonia spike wouldn't the other fish be in trouble as well.
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Old 01-14-2017, 10:12 PM   #4
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That is the adipose fin of the fish. Considering the fish is a color morph of the Black Tetra (http://animal-world.com/encyclo/fres...WFCh_C2975.jpg) you can see in that pic that it's a natural color for the unchanged fish. My guess is that it's just a throwback to the original coloration of the genetically original fish.
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Old 01-15-2017, 06:31 PM   #5
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Okay very interesting.
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