yes, the tank is way too small for goldies. They are adorable creatures, but unfortunately they are only suitable for ponds or very BIG tanks, because they grow large( 8-10 inches!), are schooling fish and are huge messers. A good rule is 140 gallons/shoal(5-6 goldies).
If you still want to go with goldies, a bigger tank is necessary. The easier way is to give them to someone who has a pond, and replace them with smaller species.
Good luck, glad that you are doing some research as most people don't!
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