Help! is my guppy sick? or is this a bite mark?

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CurrentRaptor

Aquarium Advice Newbie
Joined
Feb 23, 2022
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A few days ago my female guppy gave birth, the fry seem to be fine, but ever since then she has been hanging out under my filter, right next to the heater. This morning she was out in the general collective but had a huge angry mark on her back, it looks kinda like a bite. I have a 5-gallon tank with a gold mystery snail and two male guppies (the males have never shown aggressive behavior). I had an ADF at one point, but the frog died not too long ago. I tested the water, and everything looked perfect. I'm pretty new to fish keeping and I dont want to lose any more fish! Is there somthing wrong with my guppy?
 
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