I have a 20 gallon tank with 2 female Mickey Mouse platies and 1 red wag male platy. Lately he has begun to follow one of the females incessantly. He's not chasing her. He just goes wherever she goes. She's already pregnant, so I'm wondering if he's got lovin' on his mind or if he is simply waiting for her to deliver babies so he can have a fresh meal. What do you all think?