Beat in mind I’m only 90% sure they are a pair and not 2 males. They haven’t paired yet. At least not fully. They swim together and don’t attack one another though. The other 5 aurantis get attacked every now and then.
My male is thinner. Eats far less. Grows slower. Is more aggressive to the other fish. His dorsal fin is only slightly more blue than the females, not much difference. It is a bigger fin however. His head is from the side longer and shaped more like a torpedo or submarine.
The female is thicker in the body. Eats loads.Her fin is smaller and more uniform in height but it does increase in height from head to tail and when flared her fin is also quite tall. Looks like a male fin at times... Her head is when viewed from the side shorter and shaped more like the tip of a bullet. However other paired examples like DC’s don’t seem to have a female with such a short head as mine. My females head is about 1cm shorter than the males when measured from start of the dorsal to her nose.