I don't know, I would probably dump it- once you start setting up your live rocks and stuff, well finding the bad guys starts getting harder and harder.
If new rocks you cycling them? I highly recc at a bare min 5 minutes in a low salinity dip approx. 1.013- this will cause all kinds of crap to come out of hte rock, crabs, shrimp, etc and then you cn sift thru keep what you want toss what you don't.
Whatever new added, if you can put in a hosp or quarantine tank for at least 1 week, 2 would be better and just watch. A little patience and prevention to start can save you LOTS of time and money later. Yeah but's it s a real bummer not to get teh instant gratificiation