Yes, the leader line should be stronger than the main line. The leader line is the section of fishing line that is attached to the end of the main line and is used to connect the fishing lure or bait. It is important for the leader line to be stronger because it is the part of the line that is most likely to come into contact with sharp objects, such as rocks, coral, or teeth of fish. The main line, on the other hand, is the thicker and more visible line that is used to reel in the fish. By having a stronger leader line, it helps to prevent the main line from breaking when a fish bites or fights against the line. Therefore, having a stronger leader line ensures that you have a higher chance of successfully landing the fish without losing it.