Leela
what do you mean by pureed food? It's not recomended to puree fruits n veg for gliders it forces them to eat insoluble fibers that they don't usually ingest which can cause intenstinal and constipation issues. I'd recomend getting them on one of the widely used glider diets ( Bml or Critter Love are what I recommend ) and follow the feeding instructions for what ever diet you chose. The food aggression may be because they need more from their diet than they are getting. Two gliders should be getting 2 Tablespoons of staple and 2 tablespoons of fruit and 2 tablespoons of veg unless other wise specified by the diet.