not like a full cycle, I would give it a couple days and check your parameters then slowly add stuff if nothing spikes. it is still going to take a while for your anaerobic bacteria to set up shop in your sand bed, as it all dies once you scoop the sand and expose it to air/oxygenated water. but a 6 week cycle doubtfull, its like switching tanks with existing stuff, I have had fish and corals in tanks within hours of moving fully established sand and rock into them. (I always have new water ready in case something starts to go wrong though)