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I have a new 90 gallon tank that I started the cycle on jan 11th. I used brand new gavel but old filter media from an already cycled tank and 13 goldfish. I have been testing this tank occasionally and have never recived any ammonia or nitrite readings at all. but there are small levels of nitrate. is it possible it cycled over night? it never even got cloudy.Im really confused here. something dosen't seem right