I have a purple tang and melanurus wrasse that for reasons unknown to me have become quite shy and hide until feeding time. I bought a Scott's Fairy Wrasse last week and put him in the display tank (he had been at the store for 4 weeks in QT). The Scott's wrasse has been swimming actively around the tank. The melanurus wrasse is now out and about, and the purple tang is beginning to explore the tank during non feeding times. I know that using "dither" fish is common in fresh water tanks, but have others used this technique in marine aquariums?