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Goldfish are pretty hardy so you could but I don't know how long it will take. Bacteria develop quicker at higher temperatures (85F and above) and goldfish are coldwater fish so your temp would be under 76 probably. Also, goldfish are big waste producers so you would probably have high ammonia readings pretty quick and be relagated to daily or twice daily water changes to keep the levels down. I would strongly recommend a fishless cycle. The 10 gallon definitely won't be big enough for goldfish (as they grow). What would you do with them once the tank is cycled?
if its tropical why not try zebras they are hardy