I know for certain one of the fish is a female because it has held a batch of fry. I stripped them a few weeks ago (doing great) and the female has fattened back up and had her color come back. She was aggressively circling with another slightly smaller fish that I had assumed was also female. Gill plates fluffed out swimming in circles. It was not mating, there was definately aggression. Is this something that occurs between females?