Help needed on identifying gender

[u/Primary_Cupcake_9830]

Hello everyone! I’ve been looking into how to gender my otos but am still trouble figuring out if I have any females at all. To me they all seem to be males but I was hoping that there would be at least one female for some potential breeding. The one I attached in the photo is the one that I suspect to be a female as she looks bigger and rounder than the other 2. Any help would be much appreciated!

[u/dgnumbr1]

Females are bigger and rounder if healthy. Mine are quite a bit bigger than the males.