Golden Angels are small Centropyge. The one I have now I have had for 5+ years. Had it paired for several years but lost the smaller one in the crash I had in September. Mine hasn't gotten over 2.5"
The Goldflake is an Apolemichthys - And they get up to about 6-7".
Most angel fish come with some risk to your reef. My goldens do some picking on my sps. But they pick and move on. They don't focus on one particular spot or on one particular colony.
I have kept Goldflakes for about 15 years now. They are beautiful fish in my opinion. I have never had an issue with SPS or LPS. I had one that did take out some Acans, and Micromussa. And on occassion I have had Goldflakes randomly take out a zoa colony. I have lots of livestock in my tank. So when my tank is doing well I will easily have 50+ groups of different zoas. And sometimes you look one day and you are down to 48 or 49. Sometimes they take out 4-5 polyps, and sometimes they take out 25.
But in my tank, they find a color they like, they eat it, and then they leave the rest of the zoas alones for 4-5 months. Of course they always go after your favorite zoas.
Another striking fish, is the Venustus, the angel in my avatar. This fish takes a long time to adjust and get comfortable in the tank, and you need a well established mature aquarium for it to feed off of while it adjusts to captivity before it will be interested in prepared foods. But once they are settled into the tank they are pretty. Not an expensive angel, but an angel not found frequently.
The angels posted from Live Aquaria. The hybrid is probably a good safe choice.
The baby clarion is a not a good choice. The tank is too small, and Clarions are one of the meanest fish out there. Everybody is so excited about getting captive bred clarions, as if by some miracle, Generation 1 of a captive bred fish is going to be a nice social fish.
I have kept wild clarions, and I would not recommend them for a small tank, a reef tank, or a tank where you like small pretty fish.
Dave B