I kept fish for 5 or 6 years when I was in my teens and lived with my folks - had a whole bunch of tanks and didn't know a damn thing.
Recently started again (last December) now that I'm in a stable home and learned more in the last 10 months than all those other years put together!
Born Again Fishkeeper!
And yes, the tank tally has started to creep up again....4 and counting...