Black marks on faces

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howmanyds

Aquarium Advice Freak
Joined
Mar 27, 2013
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337
My caudopuncs have these black marks on their faces that I don't think they had when I first got them. Is this bad?
ImageUploadedByAquarium Advice1396909342.892428.jpg
ImageUploadedByAquarium Advice1396909354.597150.jpg
 
My multies get them from time to time as well, I think it's just marks from squabbles among them, they always seem to go away
 
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