I never heard of a four line, make sure its the right name, then I can help.
Four Lined Wrasse
Size: 5 1/2 inches
The Four Lined Wrasse has a deep blue body with two long light-blue lateral lines on each side. The fins are transparent with blue highlight. It is an effective "cleaner" fish, which scours and removes parasites and debris from other fish. It does not appreciate substandard water conditions.