Help sexing Red Devils?

[laurad83]

Hi everyone!
I’ve recently purchased 2 Red Devils. They’re about 13cm long. They were about the same size when purchased. The biggest one still hasn’t changed colour, the other one has. Was trying to vent them, but not 100% sure.
Hope someone can help.
Thanks!!

 

[Chiapet29]

First pic looks female, second picture looks like a male, good luck with them, let us know if they pair up in the future.