I'm terrible sexing Pixies; but those look like a trio of boys to me. Hopefully I'm wrong and you get your girl !

Keeping Pixies together other than in a supervised wet chamber for breeding, has an inherent risk, due to frog instincts and large sharp odontoids. Some members pull it off with mellower frogs; but Pixies are Pixies and it could turn bad at any moment without previous warning. Good luck !