Yellow lab/blackish face?

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Mlani

Aquarium Advice Addict
Joined
Dec 1, 2011
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canada
One of my yellow labs has a slight black/grey tinge to its face. Is this something I should be worried about? All params on tank are good. I did have a slight spike in nitrites just after adding all the new fish (6) but its good now.
 
Nope that's normal. Sometimes called "bearding" I think it's a male showing dominance.
 
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