One Anthias or more than one

Ok i have a Squareback Anthias (Pseudoanthias pleurotaenia)







This is what he looked when i bought him , nice and sharp colors, the square very sharp and so on. Now however , his robe his meh. I know that being alone those fish loose coloration like many fish of this type, they need harem or pretenders.



So if i add only one smaller one would that do , mine is big, is he the male, now, thats what ièm not sure about. I just don't want to se a blood sports in there. I really don't have room for more than one more.



My tank is a 150 G , 6'X24"X21"high,



6 chromis

1 convic tang

1 yellow tang

1 foxface

2 clarkii and their carpet nem

1 flame hawk

1yellow watchman

1sixline wrasse

and that squaback Anthias



I've tried to put a mirror se what happens but all my other fish go crazy as well, so in the end it makes everybody mad .









Lots of swimming room. I'm not a coral person really. Just middle of the road. more mixed reef, LPS,growing my own algaes, some are in the tank.



Display refugium, growing tank;









So could i add only one other Anthia for it to bring back the colors to my fish or does it need a harem for real. That's his colors now, very much different and paler than the first time he came home.