I am a prime example of doing things the wrong way but am happy that I changed my horrid fish keeping ways.
Before I found this site:
First tank - 10g hex - 19 years old
Was set up for 1 day and then I added 2 angels, black ghost knife, black moor, CAE
, Fiddler crab, and a handfull of guppies. They all died quickly and I gave the tank to a friend.
Second tank - 29g - 23 years old
Uncycled but lightly stocked. I bought a pair of jeweled cichlids in a tank with peaceful community fish. They then spawned and killed everything in the tank. That was 4 years ago and I still have the male who is almost completely blind now.
I decided to give fish keeping one last chance when I found this site and now have waaaay too many tanks