Hi there, I just recently bought a male marble swordtail from Big Al's in Canada.
When I brought it home and put it into my tank, I noticed that their was something wrong with it's top fin. There looks to be a chunk out of it, but I'm not sure.
I called the place where I bought it, and they said that I will be able to bring it back, but since I don't have a car and it's too cold outside, I have to wait until my friends aren't busy.
Will putting this off kill all of my other fish? Does it have a disease? Will it be okay to leave it for now?
p.s. Sorry if the photos are blurry, and in the first photo, it is the one underneath the female guppy.