sometimes fins split. then like other wounds they heal (did you know fish never stop growing--might not be very noticeable as they age--they just keep going).
Think about what other fish are in the tank.
Think about the current in the tank--do not want a lot of current with angels.
Think about the diet. Flakes, veggies, shrimp/krill, maybe live and frozen foods. Read the labels on the food containers--you will see a huge difference, one that is well worth paying a little extra for.