Dark spots on Ps Acei ?

Metermaid

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I have 4 Ps Acei juveniles - I noticed a black mark on one, he/she now has more dark 'blemishes' appearing, and one of the others I notice has developed one on dorsal fin - any idea what these are ?

Thanks

Rita
 
Can you get any pictures? Are they permanent or do they fade in and out?

I'm thinking perhaps they're a sign of stress, but this is just a guess based on very little.
 

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