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@matthewdavid I feel that you may have a point there as most fertilizers in hydroponics are synthetic. However if this is done in an aquaponics system different rules apply. Grow fish and plants in a looped symbiotic system no better way exists to grow food..

https://steemit.com/nature/@craigcryptoking/aquaponics-the-big-system-build-mature-thriving-vegetables-pictures