> One very cool answer is aquaponics. Aquaponics is a plant growing technique similar to hydroponics, which is basically growing plants in a medium other than dirt with water. The cool thing is this: Where a Hydroponics system requires you to add nutrients to the water to feed your plants (basically fertilizer), an aquaponics system uses all the nitrates produced by your fish as natural fertilizer! What a perfect solution for my laziness – I can stop doing water changes and let plants do the work for me, all the while saving (a bit) of water and always having home-grown produce on hand!

I'm no expert beyond some YouTube research, but apparently plain old hydroponics is way cheaper/simpler/more productive than aquaponics, if the fertilizer aspect doesn't turn you off.

Hydroponics vs Aquaponics: https://www.youtube.com/watch?v=J0fsehjZfzc&

Good educational video on aquaponics: https://www.youtube.com/watch?v=xg2MfC-Oi18

Here is a very nice aquaponics system: https://www.youtube.com/watch?v=wpGwK81tOIs