ANSWERS: 2
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It depends on how much bigger tank you upgrade to. If you double your tank size, you start from scratch. I find I can cycle a tank much quicker if I keep the water fairly warm, the lights on 24-7, and "fluff" the gravel every few days.
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doesn't matter how big the new tank is. if it's the same fish in a new, larger tank, than you use the same water, filter,(media included), gravel, and any other surface area in the tank with no rinse with tap water and no air contact.(drying out). that way you have the same waste creation=biological filter as before, just with some extra water volume. don't let that other guy scare ya, they are after all, goldfish.
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