My family have always kept fish, so ive grown up with them. But we used to keep fish without REALLY knowing about them - the lfs employee said that a 20L plastic tank would be sufficient for 2 goldfish! and at the time, we totally believed them because we'd had no experience before and no other information to suggest otherwise - the shop assistant said that they had enough room to swim in the tank and that made the tank sufficient for them!
I cant believe that I believed them then
And we didnt realise how much info there was to know.
And when several years later, i began to venture into the world of tropical fishkeeping because a friend had an unwanted tank with an inbuilt heater, the 60L hexagonal tank came with questionable undergravel filtration (which i now know was completely insufficient), and i accepted that because i didnt know what else to use
I didnt use any ferts or special lighting and half of the plants werent even aquatic because id been missold them.
And only a few years ago when i really got stuck into fishkeeping that i did research into how to optimally maintain tanks, and what species are best, etc. i borrowed every one of the local library's 10 or so tropical fishkeeping books and read them all cover to cover in a week. And i still didnt know enough of the whole new world of aquatic technology, techniques and experience, etc. so i joined tff, and slowly began correcting my mistakes (while feeling awful about how id done things in the past!
).
This just shows the learning curve of many fish enthusiasts - I didnt KNOW i was going wrong, or that there were better ways. And then one day i uncovered all this information, and from there i quickly improved and learned. And im still learning every day.