You have to test for ammonia and nitrates. Add food or some ammonia source to the system and wait until the ammonia drops to 0 and you can see some trace of the nitrates. To be use you need to repeat the process and see if the ammonia goes away in a day or two.
Did you make sure to get all the right equipment? You need power heads, live rock, a heater, test kits, and if you want corals you need proper lights too. A week after the move is way too little for a new tank. Test for ammonia and follow the process above.