Welcome to AA, sorry I don't know a thing about gold fish, well except that some are gold.
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Joey
37 gal FOLR for my daughter ( she is 6 yr old)
3 gal Pico mini reef.( for me)
24 gal Aquapod (wife's) reef, now cycled and currently emptying my wallet.
Welcome to the sight!!! I had some goldfish a while back and they did fine with wardley's goldfish food. its easy to find it will be at your local walmart and its the cheapest one.