Also i have been keeping fish since the 80s and alive even longer.
Lol, it's good to hear that you didn't start keeping fish before you were born...although the 80's ended almost 34 years ago, and your profile states you are 35, so you sure as hell didn't wait too long to start. Earlier in this thread you stated you had been keeping fish for almost 40 years. And of course you sound as though you are about 12, so...you are becoming more and more difficult to take seriously.
The idea about growth-inhibiting substances being produced by organisms is far from new, and it is not limited to aquarium fish. It's been discussed for decades, with endless evidence showing that many living things...both animals and plants...produce substances which are inimicable to the growth and health of those species. Normally, this would be a concern more typically in overcrowded conditions, but one of your tanks with fish living in the same disgusting soup of their own piss for years would be the ultimate expression of this. So the FF pokes around and manages to find one or two studies that say otherwise. Big deal; he absolutely must do that to keep the gravy train rolling, and frankly you can find evidence on the internet of literally anything, no matter how outlandish or ridiculous it may be, if you look diligently enough. You can't just pick the oddball studies and results that say what you want them to say, without considering the bulk of the others that all say the opposite.
You brag about nitrates never going above 25; many folks consider that completely unacceptable. I surely wouldn't be happy with it. The FF rants on and on about how everything in his tanks is all-natural...but we have a respected member here on MFK,
duanes
, who worked as a chemist in water treatment and who still tests water for fun now that he is retired. He has stated many times that he never finds any measurable nitrates in natural water bodies and flows. So...how can it be natural to have such high levels in your tank? And what is your water hardness like after years of constantly adding tap water?
I give up; you can't remember how old you are, or what amount of experience you have, or even who you have insulted which way in this thread. You expect us to watch every one of the endless parade of cartoons your mentor puts out, because apparently all will be revealed only if we absorb every word of his wisdom.
Sorry, but it doesn't take that long to see him for what he is; same goes for you. So sit back, watch your angelfish playing with their mbuna buddies, and ask yourself...is there a chance that everybody else is right, and you are wrong?
Who knows? That might be one of those startling open-minded revelations that you admire so highly.