Micro consumers are the ones who eat big or large food examples of these are omnivores, carnivores , and herbivores.
Micro consumers came from the word microscope because they are very small animals examples of these are flies bacteria small maggots ,worms and other scavengers and they can considered as decomposers.
Decomposers are organisms that cause decay or decomposition of dead bodies by returning their nutrients to the environment
Producers are the ones who produce their own food by using carbon-dioxide, sunlight and water this is called photosynthesis are also known as photosynthetic organisms and autotrophs auto means self and tropes means plant. They may be classified as plants.
Consumers are the ones who depend on the producers as plants for food some examples of these are carnivores, omnivores, herbivores. In some books you will find insectivores but they are classified as carnivores.