Im really not a salt water guy, your thread in the saltwater getting started section is the best way to get a good answer. We have some very knowledgeable saltwater guys and im sure you will get a good answer once one of them comes online.
If I was cycling a FW
tank (i actually am at the moment and im at a similar stage as you) i would be redosing ammonia. Cycling FW
are similar processes as far as im aware