I bought 5 guppies last week, 2 males and 3 females and I have a 29 gallon tank with plenty of plants in it for hiding. I thought at first my fish had ich so I started treating for that. But now, I notice that the fins are just shredded looking and all of them have this problem except one female who looks perfect. She also chases and nips at the other guppies, male and female so I think this is the cause of the fin damage. The 5 guppies and one cory catfish are the only fish in the tank so I would think they'd have enough space not to get territorial over, but she is. Should I just return her to the store or put her in a fry net/cage to calm her down? I don't want her getting stressed out in the cage, but I don't want her killing my other guppies. Also, one of the females (not her) is having fry right now and has been hanging out at the bottom of the tank with her 2 fry... She seems to be hanging out for 2 days now. I've never seen a guppy take that long to have fry, and she wasn't even that pregnant in the first place. I'm not that concerned about her, but about this agressive female. Thank you!