If you keep it in the 65G temporarily, I would play around with the rockwork to make sure there is plenty of open space for it to swim (if it isn't already this way).
The only other problem that I can foresee is the amount of food that most people have to feed for it to thrive... so make sure you've got a really good skimmer and probably some type of phosphate removal system, because you'll probably end up feeding it 2 to 3 times a day, and this, as you probably know, can lead to rising nutrients and be a detriment to your SPS. For some reason, their metabolism is off the charts (probably because they swim so much) and are usually finicky eaters to begin with, which most often results in the Idol owner feeding more than necessary to get it started eating.
I think the key is to get one that is already eating pellets and/or frozen foods in the LFS... otherwise, you're flushing $ down the toilet along with a dead Idol in a couple weeks time.
Good luck.