Welcome to the forum Chanmeir.
Peaceful fish run the entire range from truly peaceful and easy going fish to fish that only seem peaceful to a cichlid person. This is especially true of fish that you look up using search engines rather than interacting with other hobbyists. All fish must be judged in context.
I keep some rare livebearers that belong to a family called goodeids that are just fine and friendly with each other and even ignore their fry. Those same fish are called aggressive by people who try to keep them in community tanks. The difference is the context. In my tanks I keep one goodeid species per tank and the baby fish swim fearlessly with the largest adults and are not molested. People who try to keep them with guppies note that the guppy tails end up missing very quickly and the fish do not survive if left with the goodeids.
Guppies can be crowded more than many other fish without a real problem but the spine on the guppy in your picture often results from prolonged exposure to poor water quality. If the person you got the fish from had given up giving top quality care for a while before deciding to be rid of the fish, that would explain the body shape.
Peaceful fish run the entire range from truly peaceful and easy going fish to fish that only seem peaceful to a cichlid person. This is especially true of fish that you look up using search engines rather than interacting with other hobbyists. All fish must be judged in context.
I keep some rare livebearers that belong to a family called goodeids that are just fine and friendly with each other and even ignore their fry. Those same fish are called aggressive by people who try to keep them in community tanks. The difference is the context. In my tanks I keep one goodeid species per tank and the baby fish swim fearlessly with the largest adults and are not molested. People who try to keep them with guppies note that the guppy tails end up missing very quickly and the fish do not survive if left with the goodeids.
Guppies can be crowded more than many other fish without a real problem but the spine on the guppy in your picture often results from prolonged exposure to poor water quality. If the person you got the fish from had given up giving top quality care for a while before deciding to be rid of the fish, that would explain the body shape.
