I recently bought a new fish from Petsmart, ( about a day ago), she is a sunburst platy. My other male platy that I had for 2 months is chasing and nipping her occasionally, about once every minute. She is really fast, and able to get away from the male, but she looks pregnant. She has a small red patch, which looks like a red gravid spot. Should I put her in a isolation tank? I can't provide a picture but it's just like a red patch inside of her.
Oh yeah, she is also 1 inch long if that helps for some reason. And sometimes she floats in a corner of the tank not doing anything but breathing, until the male nips her.
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