Aquaponics is growing plants and fish together. The theory is the waste the fish produce is fertiliser for the plants, who return the favour by keeping the water clean. I’ve seen this work on a large scale on a recent course I attended on all things ending ‘ponics. There I saw tilapia (a fast breeding and growing freshwater fish) being farmed in tandem with various Asian green veg. Lacking a room I could turn into a pond, I thought I’d have a go on a much, much smaller scale, learn from mistakes and adapt.