Will Male And Female Bns Fight For Territory

[rust81]

I've just had to move one of my larger bns into my 130L tank as he (i think it is a he), was being picked on by the more dominant male in my other tank. I've noticed that he is now competing for territory with the other bn in my 130L. Does this mean they are both male, or could it be any combo?

 

[rocknurworld2006]

I've just had to move one of my larger bns into my 130L tank as he (i think it is a he), was being picked on by the more dominant male in my other tank. I've noticed that he is now competing for territory with the other bn in my 130L. Does this mean they are both male, or could it be any combo?

bristlenoses shouldnt fight male to female! so maybe its 2 males if you post a pic of the 2 of their heads especially then we could have a look at them?