Yes, they might be OK for a couple years, but you're going to have very big problems with that set-up SOON. 10 goldies is way too many for a 30 gallon, since they make so much waste, the water quality is most likely very bad (do you have a test kit? If so, what are your parameters?), and bad water quality will shorten your fishes lifespans seriously. So, they may look healthy, but they might not actually BE healthy. Plus, fancy goldies will get to be about 8 inches long---each---and comets can get to be a foot long easily, so eventually your fish won't even be able to swim in there, if they don't die from the bad water quality first. You will, at some point, either have to get a larger tank (fancy goldfish should have at least 10 gallons each, comets need a lot more), or you'll have to find a new home for some of them.
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