I've had my black molly for 3 weeks already and she has gotten fat ever since we got her and I'm not over feeding her so I just want to know if she is pregnet or if she's just getting fat? She has also been laying in this one spot at the bottom of the tank for a while! I. Also have another fish who is a deferent breed then her and he won't leave her alone! What should I do? Should I separate it or what?

