Bangai Cardinal help me sexing them are they a couple?

[TcStriker]

I just bought two cardinals.

I was told once mature they need to be of opposite sexes. I did my homework and although I can not find differences on the shape of their mouths, I do see a slight difference on their fins.

Let me know what you think.

alt="">

 

[Allen Michelle]

There is no guarantee way to sex them, not by fins, and by mouth, only when the male has carried many eggs and that's only a may be.

You just have to keep them together. if they don't pick on each other after they mature (looking at the pic, they should be almost mature), they are sexed. if they are the same gender, they will pick on each other