did you buy it as a "Black" or did you think there was a "Black" mixed in the tank full of Silvers? Blacks are very evident at that size and smaller..... very evident!
No matter if you get a quality pic tomorrow... its still gonna be a silver for sure! You can definately tell its NOT a black aro.
I just hope you didn't buy it as a Black aro.
The pics that tennisboi87 posted ARE What "Black Aro's" should look like.... notice the difference of the colors in the scales and fins.
Lots of rule breaking going on in this buy and sell thread. To answer your question the verticle stirpes in the fins are not seen in black aros also the tail is much too large. As for coloration, lighting in pictures can always be deceiving. Your silver does however have an interesting coloration, although once it gets older it will look the same as all other silvers.
Here is a pic of my 9" black aro a couple days before he slipped out of the tank.