New angel fish

[MisFit]

Want to add 2-3 more angels to my tank I already have 2 in my tank I've heard angels can be very territorial. What can I do to ensure there will be no aggression in the tank like size or any special acclimation tricks. What are your thoughts

 

[MisFit]

Oh it's a 50 gallon tank and there other tank mates are

3x rainbow fish
7x serape tetras
8x long fin danios
2x assorted angels