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I recently bought 4 Molly Fish and just found out that atleast 2 of them are males and 1 is female and there is 1 that I can't tell. The one that I know is female had a bigger belly when I bought her so my roommate and I thought she was pregnant. Today we were looking at the fish and notice that both of the males keep swimming around her constantly and putting their mouths near her analfin. I don't know if she was pregnant before or how they even do it. But what I need to know if what they are doing and why do they keep bothering her? ???