I disagree on a couple of points. Though it would be easier if I knew your tank size sjohnny8. Tangs go great together as long as they are not from the same family. The purple and the sailfin are in the same family so they would not work out. You could get a blue/hippo tang, convict tang, yellow tang, or one of several other choices. Assuming you have a 125 or larger. Also, I disagree with not being able to keep 2 dwarf angels in the same tank. If you introduce the less aggressive one in to the tank first you can have more luck. I've got 3 dwarf angels in my 125 who all get along swimmingly. Though I wouldn't recommend doing more than 2 and pick the types you put in carefully.