In a mixed ecosystem of autotrophs and heterotrophs what happens when the heterotrophs allows the autotrophs to grow and make excess organic carbon

In a mixed ecosystem of autotrophs and heterotrophs, heterotrophs allow the growth of the autotrophs inorder to utilize the organic carbon more better way and which diminishes the amount of carbon availability. CO2 will be produced from heterotrophs will be utilized by autotrophs and grow more, eventually leads to the growth of heterotrophs by using available carbon and autotrophs s food source.