New tank syndrome in an addition?

[doch]

Ok, I added a frag tank and a water change tank to my relatively new, but fully cycled tank. I have noticed over the last couple of weeks that the algae in the frag tank has exploded. Up untill now, I just figured that I need a clean up crew, but tonight my wife suggested that it's only NTS. Is this possible? The frag tank is the same water as the 160... but it has a huge algae bloom. Is it a bloom that I should wait our, or should I add some serious clean up crew?

Something to add... I'm running cheap made in china ebay style LED lights on the tank. All the corals seem to be doing OK.. not spectacular, but OK... could this be the problem?