Queen angels are anything but reef safe!!!
If you want angels in your tank, you better not have clams. They're food for pretty much any angel that you can get. I've heard that some people's angels don't nibble on the mantle, but They probably were feeding their fish quite a lot. Any tang is reef safe, and as long as they're not similarly colored or shaped you'll be good mixing them. Sometimes even if they're similarly shaped or colored. I've kept unicorn, vlamingi, chevron, scopas, and probably a few others. the Unicorn was by far the hardiest and into eating algae off of everything.