Do you have fish? Do you like to grow your own food? Sounds like you should give aquaponics a try! Aquaponics is a system when aquatic creatures such as fish, snails, crayfish, and prawns work in a symbiotic relationship with hydroponics. The aquaculture naturally produce microbes and worms, which convert into fertilizer for the plants. The hydroponic plants then filter the water for the fish.
This symbiotic relationship not only benefits both the fish and the plants, but this process saves water that would otherwise need to be used in a traditional hydroponic system.