While you never mentioned goldfish, I'll second Bev's opinion that they're not a good choice for this application. They generate a lot of waste and poison their water faster than most people account for.
Guppies and similar small fish are what I always say in the pots when I was in Thailand. A buddy kept them on his deck the entire time he lived there (>2yrs) -- they were there when he arrived, and they were there when he left. As far as he knew, nobody tended to them at all.
Matthew
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