4" miniata grouper = proceed with caution...... fish of equal size or bigger only, for fear of being eaten.
I would choose from angels / tangs / butterflies.
Stay away from the very large / very aggressive / very timid angels and you should be ok...... I would consider emporer / asfur / maculosus...... but really most should be ok.
Tangs - again, I would avoid the very large (naso) and very aggressive (sohal) tangs - and unless you have properly quarantined everything, I would stay away from ich prone species with hippo (regal), power blue, achillies etc. What I am getting at it "choose a zebrasoma" I suppose.
Butteflies - again, have you quaratined? If so, a nice pair of semilarvatus would be outstanding!
Just my thoughts & opinions. You have some nice hardy fish there - my only advice would be do not draw hassle on yourself by introducing an ich magnet....... unless you have quarantined and hypo'd all your fish and have a guaranteed ich free system.
HTH
Matt