Thanks for all the input guys. So what I gather so far:
1. Bowl is ok for bettas. Adding a plant or lucky bamboo plant is nice too as it creates a mini system.
2. Goldfish are messy and require at least 1 gallon per inch of fish. Thus, bowl is not a good idea.
What about a mini tank? There are a whole bunsh of 2-5 gallon tank kits including filter and air stone. They are designed for bookshelves and desks I think. I bet one or two goldfish would be ok in there.
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