Tap water has Ammonia and Nitrates!?

ammonia is around 1ppm, ph 6.7, nitrites 0, and nitrates at 30-40 based off of my api test kit. I've started this tank and beginning to cycle already due to the fact I seeded it with used media. My question is if I can even use my tap for water changes? Introducing 1+ ammonia into my tank, even if cycled,... show more ammonia is around 1ppm, ph 6.7, nitrites 0, and nitrates at 30-40 based off of my api test kit. I've started this tank and beginning to cycle already due to the fact I seeded it with used media. My question is if I can even use my tap for water changes? Introducing 1+ ammonia into my tank, even if cycled, would be toxic at least for a little bit (perhaps using prime as my conditioner would solve this)? And Nitrates would never go below 40, also a problem. The tank is 60 gallons so i'd rather not do a 50% water change with RO water. Do I have any other options? can I carbon dose my tank like a saltwater to lower nitrates? Any input would be helpful!
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