In my opinion its a VERY bad idea and does not take into account that the bacteria we consider to be "good" can easily turn "evil", keeping in mind that bacteria will take advantage of any chance given to explode their population levels of which sugar does just that. With normal levels, corals and fish can ward off "good" bacteria from infecting them, but with high levels, corals and fish can become overwhelmed and infected.
Dosing Sugar or Vodka
Chuck