i have an 8 inch achilles and yes he can pester the other fish.he will nip at the other fishes fins.
he is the biggest fish i have and he is in the tank with 3 other tangs but he dont outright attack they just chase them for a second here and there.
he goes after my fowleri here and there but the foweli is way too fast for him.
awesome fish seems to be my most hardy fish believe it or not.
he has been through ich treatment for the last 3 1/2 months this ich just wont go away so now they are being qt with antibiotics but seem to keep healthy.
never a day with out eating.