Have you kept these fish or are you just adding to this thread because of information you have read. Like you say in another Thread you can be an expert by just reading a good book.
That was not what I said. What I did say is that one can do thorough research and learn what needs to be known about a species and thus make the decision whether or not to acquire it based upon these proven facts without "trying" what in most cases is not going to work long-term. Research has to be thorough. When I was doing my second degree, I did endless research, reading every source I could come across on the assigned topic. We learn by building upon the past, otherwise we become like the individual sitting in front of the cave rubbing sticks together to make fire. One can and should learn from those who have already gone through this. That is how society and civilizations advance, and it is how the hobbyist succeeds.
One does not have to drive a car off a cliff to know the result.
I admit that with all the conflicting and differing advice we can find on the internet, separating the wheat from the chaff is not always easy. But it does not take too long to learn who is and who is not knowledgeable in this hobby. Others have done the experimenting, but in a controlled setting where reasonable conclusions can result. There is no logic in re-inventing the wheel. And especially in a hobby where living creatures are being subjected to whatever we force upon them.
When it comes to knowledge about the inherent requirements of each species, and the habitat conditions in which that species has evolved and in which it
will thrive, there is no "experience" of any relevance if it ignores the reasoned conclusions of others who have the knowledge and the ability to use it. When I research a species, I consult every available knowledgeable source, and the result has always been success.
In the past 12 years, I have only encountered disease in my fish three times. Each time I consulted someone who knows more about this than I ever could. I did not start "experimenting," I listened to the voices of experience and knowledge gained by those individuals through their learning. And I saved my fish. But even more, my ongoing research has taught me what will work, and the longevity and health of my fish is the result.
Last December I was told that I had a few months to live, due to the rapid and sudden spread of the cancer diagnosed some years back and which had been in remission. I was referred to the Cancer agency, and assigned an oncologist. I told him up front that my life was in his hands, and I had no intention of not following his advice. He said it did not look good, but he proposed a program and I followed it. Along the way, I encountered various side issues that could in themselves have ended my life overnight, but I stayed the course and followed his advice. The cancer has been stopped dead in its tracks; it is still there, but it is not spreading, and I am now undergoing immunotherapy. The oncologists' six or more years of medical study is what I relied on, not some half-baked nonsense that I could have read online.
When ichthyologists and biologists have spent six or eight years learning fish physiology, only fools would ignore their wisdom.