A closer shot of the tail might be your determining factor. Females have the tails rounded, where agassizii is concerned, at least for the Red. I do believe that your "female" is a sneaker male. Many of the pairs sold at C328 are not true pairs, because the supplier sends fish without properly sexing them beforehand.
In any case, when the female is in condition, after she lays eggs, her body will turn bright yellow and the middle line will disappear and show a black dot right in the middle of her body.
To be really sure that you have a female, it should have laid eggs already while still at the LFS.![]()
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