17 litre bowl? Sorry to be the bearer of bad news, but that's not suitable for any fish at all- not goldfish, not minnows, nothing. Sadly there's no law about what can be sold as a fish tank- as long as it holds water then it's fair game. But people have successfully returned small fish tanks and got a refund stating the 'not fit for purpose' section of the Sales of Goods Act.
I wouldn't keep fish in anything smaller than 45 litres, but the bigger the better. Small tanks are often sold to beginners because they are thought of as easier but it's actually really hard to maintain the water quality in a small tank. I had a 30 litre shrimp tank for a couple of months and it was a royal pain in the arse, I was doing 4 or 5 water changes a week and just gave up in the end and moved them into a 60 litre.
Something like a 60 litre tank is perfect for a beginner, it's not big enough to be really expensive or take ages to clean, but it's big enough to be a bit more forgiving of water quality issues.
If you need anything to help you, the RSPCA recommend a minimum tank size of 45 litres (10 gallons). I can't find the link because their website has been tinkered with, but if you go to the ask a question link then it'll tell you on there.
Sorry for the bad news, hope you find it helpful though. If you do get a larger tank then you need to allow about 6 weeks to make it ready for fish.