Me 5. As you've got cured live rock you're probably going to be ok, but if you aren'y ok you'll likely know by now. I am quite a fan of urchins as very effective algae eaters though many will also demolish more desirable creatures when they're out of algae.
Any I would likely sit back and enjoy for a couple of weeks. My tank took the best part of a year to settle down, so don't rush too much.