Food is what causes it.. that and anything on your hands/arms that you put into the water....
Do you have a sump? Overflow system? Do you use an overflow box? Just adding an overflow box, to an existing overflow will increase the ammount of surface skimming that happens.
Dave
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"Fins to the left...Fins to the Right, I'm going home to play with my reef tonight..."
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
