In order to break down the sugars the micros feed on nitrogen to make the conversion. Its all orgaic too which means the rate of conversion is linked to pH, soil microbes can temporarily outcompete plants for nitrogen through a process called immobilization. Microbes consume organic nitrogen and convert it into their own biomass, holding onto it until they die or excrete waste, at which point the nitrogen is released back into the soil in a plant-available form. This is especially common when carbon is added. Also of note, sugars especially glucose is a oxygen scav, if your medium is even close to oversaturated sugars will tip it over and cause a lacknof oxygenation in a medium. Not long after things go anerobic its game over.