In my own case I had never fully understood the details of the two species of bacteria that make up the biofilter in my previous period in the hobby. Once I began to understand it I was really fascinated and found myself in denial that virtually every body of fresh water anywhere in the world would actually -have- some of these two species in there somewhere!
So to me it felt like a kind of fun little scientific expedition right in my son's new fish tank to see whether these nut cases on TFF were telling the truth or pulling a big hoax, lol. After a lot of hard work and ups and downs, I not only proved to myself that it was for real, I was actually rather stunned at how healthy my tropical fish were right from day one. In years past I had had plenty of experience seeing fish both healthy and unhealthy and I knew quite well the contrast between the two. Providing a fully functioning robust biofilter and learning the good habit of a weekly water substrate clean and water change routine are clearly at the core of success in the hobby. Somehow I just got quite a kick out of finding that those correct bacteria were right there in my pristine clear tap water and that they could be brought out by using a little clear household ammonia!
~~waterdrop~~