Silver dollar i.d?

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Lol nah I'm the doctor, you lot need me!-)
 
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After some research maybe metynnis altidorsalis

Screenshot_20171028-223157.png
 
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My guess would have been either Metynnis hypsauchen or Metynnis argenteus.

The male (top pic) looks almost identical to my big male when I had him, and I believe mine to be M. hypsauchen (they display spots near their gill plates when spawning).

The female (bottom pic) however has a lot more colour than either of my girls so take what I say with a grain of salt. :)
 
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