Check your filter pad and make sure that it is not all packed and full of crap and do at least 55 percent of water changes for the next week but keep a eye on shock to your fish.
Do you have another reefer close by? Take a some of his live rock or used filter pads/socks and seed it with yours. It should help speed up the nitrogen cycle. If you already have animals in there do water changes right away as ammonia can causes crashes very quickly.