Julio- I am assuming that you added the two large angels at the same time? I would like to put an emperor and majestic in my 180 but am fearful that as they mature they will fight to the death. I plan on getting two medium sized juveniles.
As for the 3 pygmy angels that was the original topic, IMO I would not attempt adding a third to an already established territory of the two angels you already have, especially a lemonpeel who happens to be delicate (picky eaters) and easily stressed.