remember a cycle in saltwater doesnt have a set time. it all depends on the tank ,size, and husbandry. if owner is adding stuff while cycling then they post pone or prolong proccess. testing is only proof. ammonia needs to spike and without water change it must drop. this will increase nitrites then nitrates. this is a cycle so test test test. when nitrates spike and other levels zero out, do a water change ...then in next weeks watch for ammonia spike ...any signs means cycle still happening. if ammonia stays zero and only nitrates rise you should be cycled but the longer you dont add / mess wth tank ......after this occurs the more you stabilize the tank for long term.