No, I didn't. My first set-up was my 40l with some goldfish. The very first time I did that it did not go well. The second time was a few years later and I took a friend who has a lot of fish along with me. Only problem was, she didn't have a clue either. I know that now. Luckily most of my first fish (2nd time round) survived. I have one with me and the others went to live in a pond.