Possibly/ more than likely pregnant but I'm not good at telling with the mollies.. they're balloon x sailfin babies so they're always super fat lol. Her brother in the pic is the biggest fish in the tank. Thanks!
Looks to me like nips. I would isolate this fish and treat them.My striped Raphael catfish has had its tail like this for quite a while. I originally suspected it to be fin rot and I’ve treated the tank twice now but it seems to stay the same. I have a rainbow shark in the tank as well. They tend have some territory disputes, not many that I ever see, and when I do see it’s usually just 1 fish running from the other for a second and that’s it. I’m not sure if it’s constant daily nips and quarrels or some kind of bacteria. What do you think from the pics? They aren’t great but it’s the best I can do haha thanks for the help