[Quagmire]

The established sand will already have bacteria,and the LR could be cycled or partly cycled when you got it.So maybe only a smaller start up cycle.Check to see if your Nitrates are going up,if so then your bacteria are doing the first part.Keep an eye on your Ammonia,it should climb up or down to 0 from here,depending if there is any dead stuff in your LR or not.If it stays the same over the next few days,you may want to get a new test kit.Myself.I wouldn't add anything other than your rock.Also once your tank has cycled,your still not done.It will cycle over and over a bit smaller each time.Untill you add livestock,then an other cycle will occur due to feeding and waste.Give it another week and see where your at.Smelly uncycled LR will take 6 or more weeks to cycle,so be patient it shouldn't take too long with cleaner rock.