I had a 20g High SW some 20+ years ago. Conventional Wisdom was a lot different then, most of my "knowledge" came from pocket books and the LFS. I wanted a Mandarin very badly, tried 3 times, each time it lived 4-6 months. I thought I was "successful" each time, because, well, they lived for months...right?? I couldn't figure out why they died though...
Now I learn that I slowly starved them to death....I still regret that....