Daniel, The worms are all over the place in there but most of them eventually get to that plastic container you can see on the left in the small fish tank. The "chiller" in that configuration is not being used as a chiller, it is only there to provide more surface area for bacteria to grow. I can add a lot more worms now that I added that "chiller". The water starts in the small fish tank. There is a plastic container in there (the green thing) and in there is a tiny powerhead that pumps water to the chiller. From the chiller it comes down that black tube to the white trough. That picture also shows another tube going into a container in the trough. That is filled with carbon and is fed from another tiny pump. That other tiny pump is now removed and was just there as the thing was cycling. Now the water in the black hose from the "chiller" goes to that container of carbon. It does not have to resemble this weird thing at all. Any tank with moving water can be used to keep worms but if more surface area can be in there, you can keep more worms. The trough and chiller also allow more air to get into the water as there is more surface area for the air to get in the water. The powerhead sits in a container because the worms don't swim and I don't want them in the pump so they stay on the bottom
I think it's really awesome that you are into that. I keep hearing that world hunger will be cured by eating insects.