[SDguy]

A lot of times anthias will get full male coloration, but only after a long time will they get those extra long caudal tips, pelvic fins, dorsal spine, etc. IME. If he's doing fine, I wouldn't worry about him needing others of his kind. Maybe go with some barlett's if you want more anthias (hardier, similar shape to dispar, less scappy than lyretail).