Hey. . . I know some people's tank takes anywhere from 1- 3 months for their tanks to completely cycle and I know first hand that it is possible for a tank to be cycled within 7days (personal experience but I do not suggest it no matter how many years i've been in the reef business) but just to be on the safe side I'd say cycle your tank atleast over a month AT THE LEAST. . . the long wait will save you money in the long run and you will have a healthier system. . . even if you don't have fish in your tank . . . inverts including corals are more delicate than fish in most cases so take it slow. . . also make sure that you have the proper lighting in order for your tank to thrive. . . do your research first if you just want to keep softies or sps . .. maybe even both?? First identify which corals and inverts you want to keep and then go from there
