Bazar fish........Wierd

Ok this is a odd one and I have no idea, so maybee some of you guys will. Some of my fish are rubbing aginst rocks and darting around the tank. There are no spots, nor should there be as the SG is at 1.009. There is no visible fungus. All the fish's colors are at the brightest they have been. Even the yellow tang looks good. No head erosion, nothing......whats going on?
 
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