I agree with water changes as an emergency measure. However, in the long term we need to figure out why they are that high or it will likely happen again. You either have too many nutrient inputs (fish) or not enough nutrient exports (filters).

How is your livestock looking? Did you only have nitrates or ammonia and nitrite also?

When you get a chance fill out a Reef Showcase (located in your UserCP at the top). This will allow us to see at a glance what all you have going on with your setup.

Since we don't have that yet, how large is your system, how old, how many fish?