I have a pair who have bred only once - the rest of the time they often act like they hate each other - 'bickering' a lot, but have never done any damage. The male is usually dominant, but occasionally the female is the bully, and sometimes they act friendly; sometimes ignore each other.
There is less friction now they are in a larger (3-foot) tank.
I actually though I might have two males until the female laid eggs. Even now the only difference I can discern (sex-wise) is the female's breeding tube, which has remained visible after spawning, but wasn't before that.
I don't know how on earth people sex these fish!
Also, mine were very timid when I first got them and hid a lot, and were reluctant to come out even for food (the female was the braver one in this period). They have become braver over the months, and will now take food at the surface, but it's taken a long time to get to that stage.
There is less friction now they are in a larger (3-foot) tank.
I actually though I might have two males until the female laid eggs. Even now the only difference I can discern (sex-wise) is the female's breeding tube, which has remained visible after spawning, but wasn't before that.
I don't know how on earth people sex these fish!
Also, mine were very timid when I first got them and hid a lot, and were reluctant to come out even for food (the female was the braver one in this period). They have become braver over the months, and will now take food at the surface, but it's taken a long time to get to that stage.