A Little Somethin' Every Now and Again
For quite a while, you can get away with the substrate providing nutrients, especially to root feeders.
A couple of decades ago folks messed about with the no fertz thing, just doesn’t work in real life. Trying to just feed fish can work for a while, but again…
The high nutrient substrate or overfeeding fish just has its own drawbacks.
If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
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I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.