It looks like you are getting an entire system and some very nice Live Rock too.
The key to swinging the tank around would be patience (lots of it), and a good plan to remove the algae and the nutrients locked up within it. I recommend manual removal, including scrubbing with a brush, water changes, a fine tuned skimmer, and definitely lights out for a long period of time. Just keep in mind that the algae die off could cause more problems if you don't run the skimmer and perform water changes. By not removing the algae or allowing it to die of in the tank you are essentially allowing the nutrients to remain in the tank.
You can certainly add a CUC, but don't plan on them making a significant impact on removing the algae.