If you can get to Edmonds, there is a tropical fish store called Aquarium Co-op that I would recommend to EVERYBODY. The owner is very experienced and knowledgeable, and takes great care of his fish. He currently has some locally bred halfmoon females in stock, and they are quite pretty! They are already in a sorority setup, so I'm guessing it would be more likely to be successful in your tank too. There are blues, reds, and some greenish. I can tell all the girls apart, even if some have similar colors. So as I said, if there is any way you can get to Edmonds, I HIGHLY suggest you go there!
Kindness and respect should be shown to all animals, no matter if they are furry, scaly, big, or small. Be a hero to the animals and GO VEGAN!