I picked up this midas / red devil from my lfs how do you tell the difference and what size are you able to vent
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+1 to everything said here.I agree, it does appear to be a young male, but females can also grow humps, long fins, etc, so that's not an exact science. Venting is the only truly accurate way of sexing this species.
As far as being a midevil, no one can simply eye ball your fish and tell you what you have. It just can't be done. See the sticky/s at the top of the page for more info.