They are both females so I really think they both are pregnant. Lol. You have almost as many pregnant fishys as me!! Lol. Also I would recommend not keeping the glo tetra/ Glofish by its self. They are schooling fish. They need at least one friend but would be happiest with 3+. I really need more than what I have, they are just so expensive... And I now have 4 pregnant fish in that tank so I'm running out of from!!