What size is your tank? What method are you using? What is the temperature of your tank? This type of information is needed to give you an answer. How long have you been getting ammonia readings and how high?
Do you have fish in the tank?
If you have posted before and I am just missing something forgive me. I do not have the time to go back to check for prior posts on every post I look at and I do not remember your posting to me before. I do apologize if I have and have forgotten.
If you are using ammonia, yes it is unusual for the cycle to take this long. If you are using fish food, shrimp, fish or have put live fish in the tank to cycle it, it is not usual but not overlong either. If you are using a cycle enhancer like Cycle or one of the products supposedly used to speed things along, they do not. The cycle you get is unstable and will fall apart like a house of cards when you stop using the product. (perfect insurance for the manufacturer)
Rose
