Is this on a 150? The thing is he WILL IMO nip at the coral. The bigger the tank and the more coral, the less you notice coral damage because there is so much more for him to pick at so they take up the slack for each other. They usuall find a favorite thing to pick at, and some things they really dont. So what you gotta do is ask yourself this. I know he will pick and nibble, but do i have a big enough tank so that the damage is negligible and not irrepairable? This should guide you. If you want my own opinion, with the 150 i wouldnt do it, not even with your tank, not since you say you love your SPS. Go buy a 120 and just put a little lr, sandbed and wet dryor skimmer and make it a FO, then get your angel, and even more angels.