More water changes. As long as there are fish supplying steady ammonia, you can't really slow your cycle down with water changes. +1 on what High Thinker said about gravel and media, if it's possible, having fish keeping friends or another tank helps there, that can bring in other nasties depending where you get it. More plants. Can't go wrong with water changes, but be warned that it seems 3 times harder than ammonia to get down, definitely the hardest part of the cycle. Dr. Tim's One and Only can cycle it within a few days. This is one instance where I do recommend salt, the concentration is low and very effective for it's intended purpose.
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