Single tail goldfish (comets, sarassa, fedders, etc) can grow to a length of ~10in. "Fantail" varieties are better suited for a small base area water feature. Since one will be viewing them from the top, take the time in selecting fish from looking from above for interesting patterns as one does w/choosing koi.
If you have animals that will "fish" them out of the barrel at night, you can get one of those motion activated water sprayers to scare them off.
JM2C.
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