Aquaponics

It turns out aquaponics is an amazing system of growing food.
It's all about creating a tiny ecosystem in your backyard.
In essence, you get some fish to crap in some water, then offer that water to some plants.
The plants gratefully take all the nutrients out of the water and offer it back to the fish to crap in again.
The water cycles around forever and you add a bit to replace evaporation and whatever the plants use.

Inputs into the system are

-fish food
-sunlight
-water

Outputs are

- vegetables or flowers
- fish (or not -  you can just use goldfish)


I'm going to have a crack at it (actually I've already started).