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Hi hugger88324:
Thanks for doing a fishless cycle. It looks to me like you're doing everything right. What was your ammonia source to start cycling? If your tap water has chlorine or chloramine in it, are you pre-treating with a water conditioner? What was your highest ammonia reading during Weeks 1-4? Did you use a bacterial additive or starter?
If you could temporarily bump the water temperature up into the '80s that might help encourage the growth of the bacteria. Also, if you have an air pump on hand then some additional aeration might be helpful, too.