Need Help Determining Gender On Severums

[samdunne1980]

Hi there I wonder if anyone can help us sex the severums please. Also can you tell us what type they are obv I think the larger one is green severum but is the smaller red shoulder? The larger one often chases the smaller and also digs out stones. Is this rest break possibly??

 

[star4]

Pictures would help.
 
If the smaller one is a red shoulder/rotkeil severum a male would have marks on the gill plate, sometimes reaching across the front of the face between the eyes, these would be squiggly lines, a female has a plain blue face with no markings. A female green severum would also be free of facial markings, a male green does have facial markings also.
 
Male green

 
female green

 
Rotkeil Male left female right