How do you lower ammonia levels in fish tank?

This one is simple, just change your water. If you use your tap water try using a different brand of water like publix bottled water. Or you can put plants in your tank to filter out ammonia. Also beneficial bacteria that you can find at pet stores also work really well. Or if you could get a bio-wheel filter which filters out ammonia, nitrates, nitites and more. a good bio-wheel filter is the Marineland emporer 400 for up to 90 gallons but i would only use it on a 70 ogallon or less size tank.

Water changes are the answer to almost any aquarium water issue. 10% a week, and problems will be minimal.