Silver Dollars Darker Tail Edge?

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a1wonder

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The silver dollars I'm keeping around 4 years old and a little under 6" and for the past year or so they have developed a black edging on the caudal. The younger two maybe 7 months or so and about 3" do not display this.
And more resently they appear to have what I'm guessing is an uneven slim coat where it is entirely missing in some patches (I'm pretty sure this is not a fungus but you can only notice it when the light hits them in a certain angle.
Dose anyone have any suggestions or idea that they wouldn't mind sharing. Also does anyone else have this dark edging trait on their adult Silver Dollars?
 

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