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I agree: a macmasteri-group species (probably A. macmasteri) female. All A. trifasciata will show a diagonal stripe running from the pectoral fin to the anus.
Can you get more females? I ask because the fish in the photo has rather long ventral fins for a female - and the dorsal isn't exactly what I'd expect, either. Besides, A. trifasciata is a species that is best kept as a harem.
Unfortunatley this was the last female they had...the owner said they do get them in whenever they make orders, so I will keep my eye out for the next order and try and add another female