male or female (red terror)

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Normally, a dark area in the dorsal fin indicates a female.
Also a more torpedo shaped profile indicates female.
Without a male in the tank, a female may look like this.

add a male, and her colors can change dramatically, same female as above

males "usually" have a lack of dark color in the dorsal, and a much steeper profile

 
Because at 3", mature traits may not be apparent...if I was pressed...I do see a bit of dark in the dorsal, and the profile is (so far) torpedo shaped. At this point, it looks female to me.
But a clearer shot with the dorsal extended would be of help.
 
Because at 3", mature traits may not be apparent...if I was pressed...I do see a bit of dark in the dorsal, and the profile is (so far) torpedo shaped. At this point, it looks female to me.
But a clearer shot with the dorsal extended would be of help.
 
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