Bangaii cardinals sex

[Weevo]

Is there a way to tell if a female or male. I have one that seems lonely and want to get another.

 

[Phycodurus]

hello @Weevo,

here's a prior post that will prove useful: https://www.reef2reef.com/threads/sexing-banggai-cardinalfish.358183/

 

[OrionN]

Jaw structure. I breed them 20 years ago. Looking at the Jaw you can guess male or female. Male have slightly broader jaw. It is nto easy to tell, but looking at a group of mature Bangaii, one can guess with more than 50/50 regarding sex of many of the individual.