It was at first believed that the Glecks would overrun the planet with their population explosion and devour food sources causing a food crisis. But not only do the Gleck self regulate their populations by less breeding in more populated areas and by moving on to new lands and planets, but they also have a natural ability to speed up the growth of plants. The Glecks being herbivores help create bumper crops of food for the people that they serve. Allowing them to live off some of the excess food.
The Glecks have been a great help to the universe, and so long as we continue to respect them and allow them to do their work, they will continue to be wonderful friends to the Searadithians.