Hey everyone, I have a question concerning my female platy that just gave birth about 3 weeks ago. I have a 20 gallon tank with 5 platies (1 female hifin platy, 4 different male platies), 4 neon tetras, 1 Julie Catfish, and 3 happy baby platies that just got big enough to swim around freely in the tank without fear of being eaten xD. My question about the female relates to her current activity level. When she was pregnant and before, she was very lively and when pregnant almost aggressive to the other non-platies in my tank. But once she gave birth, about a week later, her activity level went way down. Now she stays near the heater at the top of the water or sometimes goes down to the very bottom and rests. In each position, she stays in the same location for a very long time considering how active she used to be. She still eats, but I've seen this behavior mark unhealthiness in other fish I've had, but part of me wants to think it's due to the stress the other male platies have put on her. I didn't get her intentionally at first. The pet store owner accidentally gave me a female and I didn't realize it until I got home and she was in the tank. But the males would frequently swim around her because I guess they wanted to mate again. Her giving birth has obviously tired her out and I think the stress from the others are taking a toll on her. What can I do? Is she sick? Is there something to help ease the stress if that's what it is? I don't have another fish aquarium at the moment to put her in and there are no visible marks or any bacteria/parasites on her. Any advice is greatly appreciated. She's not in a dire condition, but she is getting slower and less active by the day.