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Sugar eliminates algae?

     A recent trend among saltwater reef enthusiasts is to add a small 
     amount of sugar (sucrose) to their tank water, which reduces the 
     amount of nitrates and eventually eliminates algae (see 
     rec.aquaria.saltwater.reefs for further discussion).
     As one netter explained, "the sugar is used as a carbon source by 
     denitrifying bacteria and speeds their ability to reduce nitrates." 
     The recommended dosage is about 1 teaspoon per 50gal.
     I have never attempted this, nor am I interested in doing so.  
     However, there seems to be many happy reefers who do.
     Could sugar be the secret ingredient in Liquid Vital?