It is easy to think that you need some sort of a big set up to raise tilapia with lakes, or big tanks but that isn't true. If you are wanting to raise tilapia for your own consumption there are other, smaller methods of doing it.
Below is a video of such a set up in Florida. I can tell he has thought of potential problems, such as water quality, water temperature, algae growth and potential predators. He has found some very inventive ways to solve these problems. Tilapia farming, especially on a smaller scale needn't be expensive but it takes a creative, 'thinking outside the box' mentality. Problem solving, I think, is an underrated skill.