Neon Tetra turning black

[sc166]

I just noticed one of my neons getting some black throughout it's body and fins. There is a thicker black line below the part where he is red, more then usual. Is this normal? It's only a little bit but enough to be noticed.





I feel like there is a really obvious and compels normal answer to this but I can't be too sure.


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[Delapool]

Might be just normal although I never had any like that. Has it developed quickly or gradually?

Also I'd check ammonia / ph (in case ammonia burns) and if he is still eating and schooling (in case bacterial).

 

[sc166]

Might be just normal although I never had any like that. Has it developed quickly or gradually?

Also I'd check ammonia / ph (in case ammonia burns) and if he is still eating and schooling (in case bacterial).

It was very abrupt but went away a couple hours after noticing it haven't seen it sense!


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