Fresh,
I would do at least a 30% water change. Won't bring alk down a heck of a lot, but it will get it closer to what you really need. BTW, what is your pH?
Also, there is an article in the Reef Chemistry sticky thread that might have an answer for you ....
Solving Calcium and Alkalinity Problems:
http://www.advancedaquarist.com/issues/nov2002/chem.htm