Actual adult size for a RRS?

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8" seems about right, I have never seen one above that. I too have heard that max size is 12", but I'm doubtful that it's true.
 
unless they get it confused with Serra Maculatus which know as gold spilo, the Argentine variant gets larger at 12" or so compare to the Brazilian variant which gets to about 8-9" or so I think
 
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