Aggressive Female Mandarin?

dvmsn

New member
I bought two mandarins that appeared to be male and female. The female beat the bejesus out of the boy and fights her reflection every night. Do I have a boy with a missing dorsal fin or an aggressive female?
 
Some of the males are "circumcised" that is the spikey dorsal fin removed. This is done because females are rarely collected.
 
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