I agree with Don Sharpe.  The ...

I agree with Don Sharpe.  The question is rather open ended.  The specific question would what you want to do with the bacteria gorwing in the tank, and why you want to gorw bacterian in an aeration tank.  Yes, it is easy to do, as a school project.  In industry, there is always a purpose: are you trying to get rid of something, such as an industrial waste, or a food waste, or a cleanup before discharge.   Maybe you are trying to grow something to sell.