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Fertilizers (nutrients) are the most important part of the planted tank hobby. Regardless of where they originate - broken down fish food, fish waste, your city's water supply, substrate or dosing the water column - they're required for plants to live and grow.Ferts are less important then most of people think.
Don't make claims like this without providing some explanation, as they only serve to confuse newcomers. It's important to be specific in instances like this.