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Hi and welcome! http://www.aquariumadvice.com/forums/f15/guide-to-starting-a-freshwater-aquarium-186089.html
I have some bad news I'm sorry. All your goldfish are pond fish. They can grow to 18 inches long. Keeping fish that can grow large in a small tank can result in stunting or at the very least the fish out growing the tank. For your fish to reach there full potential a tank of about 100g is recommended but a pond would be better.