How fast will Koran Angel grow.....?

[tangirl]

Just added new tankmates to my 150 gal. this weekend.
PB is about 6" and Koran is about 4- 4.5".
At first PB didn't like this AT ALL! He has his caves picked out an the koran found one that the PB couldn't get into. Thank goodness. Now, the angel will swim out and around the tank but if he gets near PB's cave he will chase the Koran into his own cave.
I also bought a baby picasso (humu humu) he's approx 3", PB doesn't care about him though.
Question is .......how long will it be before the Koran will assert himself? He is eating well, I just don't like that PB will occasionally chase him. (no biting or tail slapping, just chase him away)
I feel for the little Koran, He should be the king of the tank but he has a pint sized body right now
(My coral beauty is only .5- 1" smaller than he is.!)
How long will it be before my little king will rule his tank?

 

[tangirl]

I should have clarified my first sentence. PB has been in my tank for almost 2 months with my coral beauty.
The new tankmates are the trigger and the angel.
( and a lion, but NO ONE messes with the lion, he's a baby too 4")