i dont really like the nova, and IMO definately not top of the line lights, more of middle class T5HO lights. Reflectors (rephrase, Reflector) sucks, there not individual, making you lose A LOT of light.
anyway, you could have just taken a toothpick and pierced the xenia into a rock, at least thats what i did, if you plan on more corals, i would say to remove the xenia or place it in a spot on the tank where it wont grow onto more rock. Long story short these things grow fast, doubled its size in 2 weeks for me. Some people even call these as pesty as aiptasia since they grow so fast and smother other corals. I love the look of these, but i keep them on a single rock in the sand bed away from other rocks in the tank.