that fish in the container looks pretty big.....how big is the female? Where did you get the male from, and did you buy them at the same time? It could be that the smaller fish had already become female before you bought it, and now 2 females are establishing who is going to be the only female.....probably not the case, but just looking at the one in the pic, it looks big and it made me think of that possibility....just be patient and good luck