Let's use some logical thinking...
Our aquarium is a closed system. So if there is nothing taken out, where can the nutrient disappear to? Either it has changed to some form unusable (meaning it precipitated) or absorbed or adsorption by something...
So in short, what your friend said is not very true...
But, there is some truth in what ever your friend has said is that, excess nutrient will do your tank no good but more harm as without CO2, the plants will not be taking in the nutrients available... Harm in the form of algae...
Think this as building a barrack in a strategy game... You got all the lumber but no stone... How you going to build? The stone becomes a limiting factor... Same for building cells in plants, no CO2 for carbon, got nutrient also no use...
A drop or two is sufficient in your case once a while as CO2 will still be diffused at the surface of the water... And your fish will generate some CO2 too...
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