I agree with what's been said above. I will add this: if you get a large enough tank for a goldie and a school of smaller fish, then a good choice for your schooling fish would be rosy red minnows. They are a coolwater species and get considerably larger than white clouds or zebra danios, so should be less vulnerable to the goldfish's appetite. You could also collect some wild shiners or killifish in your area (check local regulations first, of course). There are some very cool natives in New England.