I started my tank way before computers or the internet was invented and there were no books.
I had more problems than I could say and didn't start having success until I realized it was bacteria, viruses and parasites that keep our tanks healthy and the less I messed with it, the more success I had.
After many years I learned that not quarantining and never using medication along with anything I can find with natural bacteria in it added to the tank allowed it to be stable and also enabled most of my fish to spawn and mostly live long enough to only die of old age or jumping out.
I really have no more problems today but it took decades of learning by trial, error and common sense.
I had more problems than I could say and didn't start having success until I realized it was bacteria, viruses and parasites that keep our tanks healthy and the less I messed with it, the more success I had.
After many years I learned that not quarantining and never using medication along with anything I can find with natural bacteria in it added to the tank allowed it to be stable and also enabled most of my fish to spawn and mostly live long enough to only die of old age or jumping out.
I really have no more problems today but it took decades of learning by trial, error and common sense.