Unfornuately, more is better is the common thought process for many.
Even if you tell this, and they day yes, they still do what they will ultimately.
They learn via suffering.
I tell folks to use less light.
No one listens.
I show examples, then they ask questions about other things than the light.
It all starts with light, that drives CO2 uptake and demand.
From there, CO2 and carbon drives N and P and K etc demands for growth.
So less slight = less CO2 demand = less nutrient demand.
CO2 is the hardest thing to measure and control in the tank, so less light makes a lot of sense there.
Or go nonCO2 altogether
CO2 and issues there are often from circulation and poor O2 levels.
CO2 and O2 are well linked for us.
It takes some folks getting their feet wet a few times, before they get a handle on things.
But hopefully you improve along the way.
Canned CO2 is one of those jumps. Less light is another, better circulation is yet another.
And that's just dealing with CO2.......