It all depends on the definition of high light, like everything else. Is my A900 high light with a Twinstar E900? I reckon medium at most! Hence my dosing and CO2 levels are pretty low! Third of EI index and a bottle of CO2 lasted me over 18 months! It also depends how long you run your lights for over the tank! I have two 12l nanos with 5w of LED and no CO2, micro dosing when I remember, but I only run the lights for 4.5 hours a day! my 60 litter also 10 watts of lights and I run that 8 hours a day! no algea in either and plant growth is fine!But High light low CO2/nutrients just doesn't balance the equation in my head at my present level of understanding, this will be the same for many others IMO.
The 2 12 liter nanos with buces and crypts and mosses! Fair enough low demanding plants, but I like an easy life
it's all about in the definition and the detail like photo period etc... I am not saying it cannot be done, course it can, but its not for the average noob to start with those methods, first learn how to grow plants and then tinker later!