I have a question, I have two black mollies, male and female, the other day I noticed that the male was bothering the female. It almost looked like he was nipping at her belly. He followed her around all day doing this. Is this some kind of mating ritual? ??? He's since stopped, and doesn't bother her anymore. But now she is acting weird. She acts like she wants to be alone, she's been hanging around the surface, between the top of the heater and the pump filter pipe,(about an inch apart). Is this normal?