What is a cheap, low maintenance fish that can survive in a small bowl on goldfish food?

I'm getting my friend a fish for her birthday. She has previously owned a goldfish and still has a small bowl and food leftover form it. Is there a low maintenance, cheap fish that is more interesting than this that can survive with these apart from a betta (siamese fighting fish)?
Asked Aug 31, 2012
This might not really be what you had in mind... What about a fishbowl terrarium?

I think those are a lot more interesting... A few weekends ago, my daughter and I found a bunch of interesting glass bowls, fishbowls, jars, vases, etc. at a big flea market and we made several of these. It was a fun, inexpensive project, and they look amazing. Low maintenance, too.
Answered Aug 31, 2012
Edited Aug 31, 2012

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