I take it you are saying you have an Oscellaris (False Perc) and a Percula (True Perc) in a tank together and you are considering adding another Percula. What are the dimensions of the tank? If the tank is too small the Clown Trigger is going to become a problem for whatever you put in there, the Angel shouldn't be a problem (depending on tank size of course) since it is one of the dwarf species. If the True Percs pair up they will certainly fend off the False Perc and wether or not they fight depends on how persistent the False Perc is.
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