Anytime I have added any new anthias to an existing population, there's a new tussle for pecking order. If you are adding females, then the male is likely to keep his spot as the top dog (not sure what you mean by 'gravitate to') but I have had losses amongst the female population as a result of fighting. Would suggest QT is a really good idea for these fish to get them fattened up to survive any initial skirmishing.