I agree with Lance. There is a lot more to breeding this species than just putting a male and female together. You really need to do some more research before jumping into this. For example: Do you know how to set up a lay box? Do you have an incubator ready? Do you have vivs and lighting for all the babies? Did you know that 20 babies can go through about 10,000 + pinhead crickets a week? There is a lot to this. Plus, you really should be able to distinguish a male from a female before attempting to put them together. I'd say this is a female, and the displays you are seeing are commonly seen with a breeding pair. Some get more aggressive than others, especially when it's a very dominant, alpha female.